# What is the the vertex of #y =x^2+4x-7 #?

##### 1 Answer

Jan 10, 2016

Complete the square to find the vertex:

#(-2, -11)#

#### Explanation:

Complete the square:

#y = x^2+4x-7#

#= x^2+4x+4-11#

#= (x+2)^2-11#

This is an upright parabola with vertex at

graph{ x^2+4x-7 [-18.61, 13.43, -12.75, 3.28]}