Find the product?

(a9)2

1 Answer
Mar 21, 2018

a218a+81

Explanation:

(a9)2=(a9)(a9)

each term in the second factor is multiplied by each
term in the first factor

(a9)(a9)

=a(a9)9(a9)distribute

=(a×a)+(a×9)+(9×a)+(9×9)

=a29a9a+81collect like terms

=a218a+81