MHB Join the MA104 College Algebra Forum at Lehman College

mathdad
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I would like to see a College Algebra forum. It is a course at Lehman College that gives students lots of trouble. At Lehman, the course is known as MA104.
 
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It's a good suggestion, though I took its equivalent in High School, not College. (Not an AP course.)

-Dan
 
MAT 104 College Algebra
Rational expressions, integer and rational exponents, quadratic formula, complex numbers, exponential and logarithmic functions, conic sections, trigonometry. Mathematics laboratory attendance may be assigned at the discretion of the instructor.
I think they all fit in the forums that already exist as https://mathhelpboards.com/trigonometry-12/ already has its own forum and the rest:

Rational expressions, integer and rational exponents, quadratic formula $\to $ https://mathhelpboards.com/pre-algebra-algebra-2/

Complex numbers, exponential and logarithmic functions, conic sections $\to$ https://mathhelpboards.com/trigonometry-12/
Some of those topics may fit either forum in any case. Someone correct me if this doesn't sound right.
 
Thread 'Determine whether ##125## is a unit in ##\mathbb{Z_471}##'
This is the question, I understand the concept, in ##\mathbb{Z_n}## an element is a is a unit if and only if gcd( a,n) =1. My understanding of backwards substitution, ... i have using Euclidean algorithm, ##471 = 3⋅121 + 108## ##121 = 1⋅108 + 13## ##108 =8⋅13+4## ##13=3⋅4+1## ##4=4⋅1+0## using back-substitution, ##1=13-3⋅4## ##=(121-1⋅108)-3(108-8⋅13)## ... ##= 121-(471-3⋅121)-3⋅471+9⋅121+24⋅121-24(471-3⋅121## ##=121-471+3⋅121-3⋅471+9⋅121+24⋅121-24⋅471+72⋅121##...

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