## Algebra 1

$a^{2} - 36b^{2}$
We use the formula for the difference of squares to apply to this question. The difference of squares formula is: $(a-b) (a+b) = a^{2} - b^{2}$ In the given formula let a represents a and 6b represents b. $(a-6b) (a+6b) = a^{2} - (6b)^{2}$ = $a^{2} - 36b^{2}$