In triangle ABC, the measure of ∠A is y, the measure of ∠B is y + 20, and the measure of an exterior angle at C is 120°. Find the value of y.

if your equation is in the form ax2 + bx + c, you can find the maximum by using the equation:

max = c - (b2 / 4a).

the first step is to determine whether your equation gives a maximum or minimum.

-x2 + 4x - 2.     thats an example hope it

boi there is no b, y= 1.0526