Find the product?
(a−9)2
1 Answer
Mar 21, 2018
Explanation:
(a−9)2=(a−9)(a−9)
each term in the second factor is multiplied by each
term in the first factor
⇒(a−9)(a−9)
=a(a−9)−9(a−9)←distribute
=(a×a)+(a×−9)+(−9×a)+(−9×−9)
=a2−9a−9a+81←collect like terms
=a2−18a+81