Question

The line of symmetry of the parabola whose equation is y = ax2 - 4x + 3 is x = -2. What is the value of "a"?

Answer 1

Answer:

a = -1

Step-by-step explanation:

To find the axis of symmetry you use the equation, -b/2a.

Since we know the axis of symmetry and we know what, b, is. We can use this equation in reverse to get the value of, a.

4/2(a) = -2

What multiplied by -2 will give you 4. Only another -2 will do that.

And what times 2 makes -2. The answer is, -1.

4/2(-1) = -2

4/-2 = -2

a = -1

Answer 2

Answer: -1

Duh because duh i just turned it in and got it correct. :D