B.)8a^3+2a^2b-36ab-9b^2
(2a^2-9b)(4a+b)
Use the distributive property of multiplication.
4a(2a^2-9b)+b(2a^2-9b)
Expand.
8a^3-36ab+2a^2b-9b^2
Put in neater order, so that powers are consecutive (i.e putting x^2 after x^3)
8a^3+2a^2b-36ab-9b^2
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