Question

What is the line of symmetry of the parabola y=x2+6×-9

x=6
x=-9
×=-3​

Answer 1

x = - 3

Explanation:

given a parabola in standard form y = ax² + bx + c (a ≠ 0 )

then the equation of the axis of symmetry is

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

y = x² + 6x - 9 ← is in standard form

with a = 1, b = 6 , then the equation of the axis of symmetry is

x = -
`(6)/(2)` = - 3 , that is x = - 3