Q29 2020 Calculus CLEP Official Study Guide

[KalebKrasher]

Set derivatives equal, find x, plug x into parabola equation to find y, and then put x and y into tangent line equation to find C.

[michaelovadiyah]

Hi. I’m trying to understand the process that you used to solve this problem. I’m not sure how 4x and 2x are equal. I understand that 4x+c and 2x are equal but I’m not sure how you make the jump to solving the problem.