# How do you find the roots for #f (x)= x^2 -4#?

##### 1 Answer

May 30, 2016

x = ± 2

#### Explanation:

To find the roots- where f(x) crosses the x-axis. Equate f(x) to zero and solve.

solve :

#x^2-4=0rArrx^2=4rArrx=±2#

graph{x^2-4 [-10, 10, -5, 5]}