Question 39865: Multiply using the vertical method.
(a^2 + 3ab - b^2) (a^2 - 5ab + b^2)
Answer by fractalier(6550)   (Show Source):
You can put this solution on YOUR website! Okay, instead of making a long list of the nine items, we will do it vertically...so we get (ignore the spacing lines...they're there to line stuff up)
(a^2 + 3ab - b^2)(a^2 - 5ab + b^2) =
a^4 - 5a^3b + a^2b^2
____+ 3a^3b - 15a^2b^2 + 3ab^3
____________- a^2b^2 + 5ab^3 - b^4 =
a^4 - 2a^3b - 15a^2b^2 + 8ab^3 - b^4
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