You can put this solution on YOUR website! Simplifying
-3(-3a)(6b)
Remove parenthesis around (-3a)
-3 * -3a(6b)
Remove parenthesis around (6b)
-3 * -3a * 6b
Reorder the terms for easier multiplication:
-3 * -3 * 6a * b
Multiply -3 * -3
9 * 6a * b
Multiply 9 * 6
54a * b
Multiply a * b
54ab