Question

The graph of which function has an axis of symmetry at x = 3?

f(x) = x2 + 3x + 1

f(x) = x2 – 3x – 3

f(x) = x2 + 6x + 3

f(x) = x2 – 6x – 1

Answer 1

Answer: Its D My Boy

Explanation:

Answer 2

The graph that has an axis of symmetry at x = 3 is f(x) = x2 – 6x – 1.

You can find the axis of symmetry by using the equation to find the x value of the vertex. The x value of the vertex is always the axis of symmetry in a quadratic graph. The equation is below.

x = -b/2a

In this equation, a is the coefficient of x^2 and b is the coefficient of x. If we use the numbers from the last equation in your list, a = 1, b = -6.

x = -b/2a

x = -(-6)/2(1)

x = 6/2

x = 3