General Math Forum

Post thread
Join in expert discussion on general math topics that are not applicable to the specific categories. This includes topics are usually high school math level. Homework help is available.

Math Proof Training and Practice

A gap in resources that should help students visualise mathematics

Math Guides, Tutorials and Articles

MHB Deriving the first and second order Newton-Cotes formulas

Math Problem of the Week

Undergrad Sum of an Alternating Series
High School Why Do Functions Have Only One Output for Each Input?
  • · Replies 3 ·
Replies
3
Views
2K
MHB John's Cupcake Challenge: Finding the Perfect Distribution
  • · Replies 3 ·
Replies
3
Views
3K
MHB *gre.al.9 GRE Exam Inequality with modulus or absolute value
  • · Replies 4 ·
Replies
4
Views
2K
MHB The number of possible permutations for the assessment
  • · Replies 2 ·
Replies
2
Views
3K
High School What Are the Variations of the Collatz Conjecture and Their Implications?
  • · Replies 11 ·
Replies
11
Views
3K
MHB How to solve X for beta/portfolio investment
  • · Replies 2 ·
Replies
2
Views
2K
MHB Difference between caustic soda and caustic potash
  • · Replies 1 ·
Replies
1
Views
3K
MHB Finding 2D Polygon Coordinates from a point
  • · Replies 2 ·
Replies
2
Views
2K
MHB The smallest circle that two parts of a semi-circle can fit into?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Does Mihailescu's theorem use the infinitude of primes?
  • · Replies 2 ·
Replies
2
Views
2K
High School Grant Sanderson on PI, Galperin's Puzzle and QC Grover's Search
  • · Replies 1 ·
Replies
1
Views
2K
MHB Riccati's equation and Bessel functions
  • · Replies 4 ·
Replies
4
Views
12K
MHB How would the year 2011 appear in standard form
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Modular Arithmetic: Find Multiples, Understand the Reason
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Euclid's formula and real numbers
  • · Replies 5 ·
Replies
5
Views
2K
MHB Maximum area of rectangle which circumscribes the given quadrilateral.
  • · Replies 21 ·
Replies
21
Views
3K
MHB Lecture Notes from Cambridge and Oxford
  • · Replies 1 ·
Replies
1
Views
4K
High School What Does $L^{-1} Indicate in Pricing?
  • · Replies 3 ·
Replies
3
Views
1K
MHB Amplitude, Period, frequency and phase angle
  • · Replies 1 ·
Replies
1
Views
2K
MHB Calculate revenue from the sale of 100 products.
  • · Replies 2 ·
Replies
2
Views
2K
High School Resolving index laws for fractional exponents
  • · Replies 2 ·
Replies
2
Views
2K
MHB Proof with Induction 3/2-5/6+7/12-9/20+11/30-....
  • · Replies 5 ·
Replies
5
Views
2K
MHB Understanding Dice Throwing Probabilities: A Layman's Guide
  • · Replies 8 ·
Replies
8
Views
5K
MHB Solving a Matrix Problem on IGCSE Past Paper: Part B
  • · Replies 1 ·
Replies
1
Views
2K
MHB [ASK] Equation of a Circle in the First Quadrant
  • · Replies 4 ·
Replies
4
Views
2K
MHB [ASK] Make x and y the Subjects: x^3-3xy^2=a, 3x^2y-y^3=b
  • · Replies 6 ·
Replies
6
Views
2K
MHB [ASK]Show that the sum of the fifth powers of these numbers is divisible by 5
  • · Replies 4 ·
Replies
4
Views
2K
MHB What are the coordinates of point D?
  • · Replies 1 ·
Replies
1
Views
1K
MHB Finding lines through given point perpendicular and parallel to given line
  • · Replies 1 ·
Replies
1
Views
1K
MHB Computation based on linear growth
  • · Replies 1 ·
Replies
1
Views
1K
High School Interested to see how others do simple algebraic manipulations
  • · Replies 5 ·
Replies
5
Views
2K
MHB Possible mistake in question? (system of linear inequalities)
  • · Replies 1 ·
Replies
1
Views
1K
MHB Solve 8^x+8^(-x)=? When 4^x+4^(-x)=8
  • · Replies 4 ·
Replies
4
Views
2K
MHB [ASK] A Circle Which Touches the X-Axis at 1 Point
  • · Replies 2 ·
Replies
2
Views
1K
High School Questions about mathematics as a deductive system
  • · Replies 8 ·
Replies
8
Views
2K
MHB Cost of Fairness: Splitting Vehicle Hire Costs
  • · Replies 2 ·
Replies
2
Views
2K
MHB Calculating Exponents for Business Model
  • · Replies 5 ·
Replies
5
Views
2K
MHB Can You Prove This Number Theory Problem Involving Primes and Coprime Numbers?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Fourier transform equation question
  • · Replies 3 ·
Replies
3
Views
2K
High School Example on pg. 23 of Mathematics for the Million
  • · Replies 17 ·
Replies
17
Views
2K
High School Before understanding theorems in elementary Euclidean plane geometry
  • · Replies 12 ·
Replies
12
Views
2K
High School Elementary analytic geometry textbook recommendation
  • · Replies 7 ·
Replies
7
Views
2K
MHB How do we expand fractions to make their denominators the same for subtraction?
  • · Replies 1 ·
Replies
1
Views
2K
MHB Evaluate 3/7 r + 5/8 s when r = 14 and s = 8
  • · Replies 3 ·
Replies
3
Views
4K
MHB Solved for Prime using Grade 4 Math Prove me wrong
  • · Replies 1 ·
Replies
1
Views
1K
MHB [ASK] Proving Trigonometry 2sinα+2sinβ+2sinγ=4sinαsinβsinγ
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Spectrum of a function vs of a matrix
  • · Replies 1 ·
Replies
1
Views
1K
MHB What is the Value of \(x^5+y^5+z^5\) Given Initial Polynomial Conditions?
  • · Replies 1 ·
Replies
1
Views
2K
MHB Euler/Riemann Point of Departure in Riemann's 1859 paper containing RH
  • · Replies 1 ·
Replies
1
Views
2K
High School How to avoid arithmetic and sign errors
  • · Replies 6 ·
Replies
6
Views
2K
MHB Need help finding Diagonals of a Rhombus
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Principal difference between complex numbers and 2D vectors revisited
  • · Replies 24 ·
Replies
24
Views
4K
Undergrad Karatsuba multiplication implementation question
  • · Replies 3 ·
Replies
3
Views
2K
MHB Fraction word problem: how many rows are devoted to each plant
  • · Replies 2 ·
Replies
2
Views
3K
MHB When the function is not constant
  • · Replies 1 ·
Replies
1
Views
2K
MHB Partial fraction decomposition (x-3)/(x^2+4x+3)
  • · Replies 4 ·
Replies
4
Views
3K
High School Proof of Cyclic Quadrilateral AEDT in Circle ABCD
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Order of summation in series with multiple indices
  • · Replies 4 ·
Replies
4
Views
2K
MHB How Can I Factorize the Equation x^3-7x^2+14x-8=0?
  • · Replies 22 ·
Replies
22
Views
5K
MHB Introductory Algebra Percentage Word Problem
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Question about Taylor Expansions
  • · Replies 2 ·
Replies
2
Views
1K
MHB How many marbles are in a jar?
  • · Replies 1 ·
Replies
1
Views
2K
Is math truly a universal language?
  • · Replies 2 ·
Replies
2
Views
4K
MHB Converting Decimal to Hexadecimal for Compass Corrections
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad How to visualize the maths behind a formula?
  • · Replies 7 ·
Replies
7
Views
3K
High School The rule for the sum of this series?
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Nested expressions as compositions of functions?
  • · Replies 3 ·
Replies
3
Views
1K
MHB Solving Minute Hand Distance from Ground Graph Problem
  • · Replies 2 ·
Replies
2
Views
4K
MHB Adding in Base 20: 1HE1C +JDF0 = 2H7GC
  • · Replies 4 ·
Replies
4
Views
3K
High School The Mathematician Who Never Was
  • · Replies 2 ·
Replies
2
Views
2K
Why don't we emphasize the beauty of math much more than we do?
  • · Replies 16 ·
Replies
16
Views
3K
MHB Digit sum rule for the divisibility by 9
  • · Replies 2 ·
Replies
2
Views
2K
MHB Calculating Total Cost with Variable n: C = 7500 + 8n
  • · Replies 1 ·
Replies
1
Views
1K
High School Understanding Horner's Method: A Brief Explanation for Confusion
  • · Replies 7 ·
Replies
7
Views
2K
MHB Number Theory Images for Elementary Course
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Can I Use a Natural Log Function for Least Square Fitting?
  • · Replies 4 ·
Replies
4
Views
2K
[ASK] Mathematical Induction: Prove 7^n-2^n is divisible by 5.
  • · Replies 5 ·
Replies
5
Views
3K
High School Number Theory Image: Hooks for Elementary Courses
  • · Replies 4 ·
Replies
4
Views
2K
MHB Help with factoring trinomials
  • · Replies 15 ·
Replies
15
Views
5K
MHB Partial fraction problem (x^2)/[(x-2)(x+3)(x-1)]
  • · Replies 4 ·
Replies
4
Views
3K
MHB How do i factorize x^3 -5x^2+8x-4?
  • · Replies 12 ·
Replies
12
Views
6K
MHB Is a Number Divisible by 15 and 18 Also Divisible by 27?
  • · Replies 2 ·
Replies
2
Views
1K
Sig figs/certainty in percent error calculation
  • · Replies 8 ·
Replies
8
Views
5K
MHB Finding Time for a Kicked Ball
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Is There a Way to Override Reserved Symbols in Webpage Code?
  • · Replies 13 ·
Replies
13
Views
2K
High School “Fixed mindsets” might be why we don’t understand statistics
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Fair distribution, minimizing envy
  • · Replies 2 ·
Replies
2
Views
1K
MHB [ASK} Prove (cos2x+cos2y)/(sin2x−sin2y)=1/tan(x−y)
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Why a is not equal to zero in this pair of straight line equations?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Area Differential in Cartesian and Polar Coordinates
  • · Replies 13 ·
Replies
13
Views
3K
High School Parabola vs Hyperbola, why does a Hyperbola have two foci/curves?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad The domain of a multivariable function
  • · Replies 6 ·
Replies
6
Views
2K
MHB What is the area of Angular Land below sea level?
  • · Replies 6 ·
Replies
6
Views
2K
MHB What is the solution to the exponential series limit problem?
  • · Replies 3 ·
Replies
3
Views
2K
MHB How to fully solve this limit evaluation using integration?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad A matter of style? Algebra, Arithmetic, Variables
  • · Replies 6 ·
Replies
6
Views
2K
MHB Calculate the length of the fourth side edge.
  • · Replies 3 ·
Replies
3
Views
2K
MHB Calculating Probability of Choosing 11 Reds in a Row
  • · Replies 3 ·
Replies
3
Views
7K
MHB Find Length of Side in Right Triangle w/ 45°, 90°, and 45° Angle
  • · Replies 2 ·
Replies
2
Views
2K
MHB What is the Surface Area of a Square with Given Points and Side Lengths?
  • · Replies 1 ·
Replies
1
Views
1K