### Home > CCA2 > Chapter 2 > Lesson 2.1.5 > Problem2-75

2-75.

If $g(x)=x^2−5$, find the value(s) of $x$ so that:

1. $g(x)=20$

Substitute $20$ for $g(x)$. Solve for $x$. Remember that squaring a negative number results in a positive number, so there should be two solutions.

$\pm5$

1. $g(x)=6$

Refer to part (a).