Question 64302
Multiply the expression: 


(a^2 + 2ab – b^2)(a^2 – 7ab + b^2)


This expression can be written as: 


{{{a^4 - 7a^3b + a^2b^2 + 2a^3b - 14a^2b^2 + 2ab^3 - a^2b^2 + 7ab^3 - b^4}}}



{{{a^4 - b^4 -5a^3b -14a^2b^2 + 9ab^3}}}



Hence, the answer.