Question

What is the axis of symmetry of h(x) = 5x2 + 40x + 64?

x = −16
x = −4
x = 4
x = 16

Answer 1

x = - 4

Explanation:

given a quadratic function in standard form

y = ax² + bx + c ( a ≠ 0 ) then the axis of symmetry is

x = -
`(b)/(2a)`

h(x) = 5x² + 40x + 64 ← is in standard form

with a = 5 , b = 40 , then axis of symmetry is

x = -
`(40)/(10)` = - 4