Try another version of this question Box 1: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Find the product
`(-7a^2b^2)(6a^2b+7a b+9b)`
Be sure your variables match those in the question `-42a^4b^3-49a^3b^3-63a^2b^3`