Question

The line of symmetry for the quadratic equation y = ax2 + 8x - 3 is x = 4. What is the value of "a"?
Step by Step Please.

Answer 1

a = -1

Answer 2

Let go step by step. First,

Answer 3

k

Answer 4

. http://media01.switchedononline.com/g_alg01_2011/9/symmetry.gif

Answer 5

We know this is the equation for the line of symmetry. Thus, we can say 4 equals to this. We also know form the equation that b is 8. So we plug that in and then solve for a!

Answer 6

ok starting to work it out