Tangents of a parabola perpendicular to a line

Click For Summary
SUMMARY

The discussion focuses on finding the equation of a tangent to the parabola defined by the equation y = 3x² - 7x + 5, which is perpendicular to the line represented by x + 5y - 10 = 0. Participants suggest starting with the general form of the tangent line, y = mx + c, or the standard form ax + by + c = 0. They emphasize the importance of identifying the point of tangency (x1, y1) on the parabola and recommend experimenting with different parameter sets to simplify the problem-solving process.

PREREQUISITES
  • Understanding of parabolic equations and their properties
  • Knowledge of linear equations and slopes
  • Familiarity with the concept of tangents in calculus
  • Ability to manipulate algebraic expressions and equations
NEXT STEPS
  • Study the derivation of the tangent line to a parabola
  • Learn how to determine the slope of a line from its equation
  • Explore the relationship between perpendicular lines in coordinate geometry
  • Practice solving systems of equations involving parabolas and lines
USEFUL FOR

Students studying calculus, mathematicians interested in geometry, and educators teaching concepts related to parabolas and tangents.

phyico
Messages
5
Reaction score
0
A Tangent to the parabola y = 3x^2 - 7x + 5 is perpendicular to x + 5y - 10 = 0

Determine the equation of the tangent

i really don't know where to start!
 
Last edited:
Physics news on Phys.org


What have you tried? Where are you stuck?
 


List sets of parameters that can specify the tangent line. Then see if you can write enough equations to solve the unknowns. E.g.

i. Let the tangent be y=mx+c.

ii. Let the tangent be ax+by+c=0.

iii. Let the point where the tangent touches the parabola be (x1,y1).

Judge for yourself which set is easier, and go on solving it. Sometimes it is hard to tell beforehand and you may need to pick one and switch to another if got stuck.
 

Similar threads

  • · Replies 21 ·
Replies
21
Views
2K
  • · Replies 11 ·
Replies
11
Views
5K
  • · Replies 14 ·
Replies
14
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
12
Views
2K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 8 ·
Replies
8
Views
2K
Replies
1
Views
1K
  • · Replies 7 ·
Replies
7
Views
3K