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

Answer:

Option 3rd is correct

x= -4

Step-by-step explanation:

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

then the axis of symmetry is given by:

$x = -\frac{b}{2a}$            ....[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;

$x = -\frac{24}{2(3)}=-\frac{24}{6} = -4$

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

Answer 2

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