# How do I find the x-intercepts of a quadratic function in vertex form #f(x)=1/4(x+2)^2-9#?

##### 2 Answers

May 9, 2015

The x-intercepts of an equation happen at those points when

Given

If

May 9, 2015

Develop to standard form:

Find 2 numbers knowing their sum( -b = -4) and their product (c = -32). Compose factor pairs of (-32). Proceed: (-1, 32)(-2, 16)(-4, 8). This last sum is 8 - 4 = 4 = b. Then, the 2 real roots, or x-intercepts are the opposite: 4 and -8.

Answers: x-intercepts : 4 and -8.

Check:

x = 4 ->

x = -8 ->