Question

The line of symmetry for the quadratic equation y = ax2 - 2x - 3 is x = 1. What is the value of "a"?

Answer 1

a = -1

Explanation:

The line of symmetry equation is -b/2a

b = -2

c = -3

`-1=(2)/(2a)`

so multiply the 2a.

-2a = 2

divide by -2

a = -1