Inactive Tutor answered 04/26/13
Tutor
New to Wyzant
(a - b)(a + b) = a2 - b2
(5b - 9)(5b + 9) = (5b)2 - 92 = 25b2 - 81
Jamal M.
asked 04/26/13(5b-9)(5b+9)=?
Inactive Tutor answered 04/26/13
(a - b)(a + b) = a2 - b2
(5b - 9)(5b + 9) = (5b)2 - 92 = 25b2 - 81
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