Question

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

-2

-1

-1/2

Answer 1

if x=-2 is the axis of symmetry,then its eq. is x+2=0
squaring
x^2+4x+4=0
-x^2-4x-4=0
hence a=-1

Answer 2

So it's -1

Answer 3

yes

Answer 4

Thanks..!

Answer 5

yw