Question

What is the line of symmetry for the parabola whose equation is y = 3x2 + 24x - 1? x = -8 x = -6 x = -4

Answer 1

x= -b/2a = -24/6 = -4

Answer 2

Option 3rd is correct

x= -4

Explanation:

A quadratic equation
`y=ax^2+bx+c`.....[1];

then the axis of symmetry is given by:

`x = -(b)/(2a)` ....[2]

As per the statement:

Given the equation:
`y = 3x^2+24x-1`

On comparing with [1] we have;

a = 3, b = 24

Substitute in [2] we have;

`x = -(24)/(2(3))=-(24)/(6) = -4`

Therefore, the line of symmetry for the parabola is, x = -4