The expression is given to be:
[tex]g^2-9[/tex]
Rewrite the term:
[tex]9=3^2[/tex]
Therefore, the expression becomes:
[tex]g^2-3^2[/tex]
Apply the difference of two squares formula:
[tex]x^2-y^2=\left(x+y\right)\left(x-y\right)[/tex]
Therefore, the expression becomes:
[tex]g^2-3^2=\left(g+3\right)\left(g-3\right)[/tex]
ANSWER
[tex]g^2-9=\left(g+3\right)\left(g-3\right)[/tex]
