(7a-9b)(7a-9b) = ? using identity(a-b²)= a²-2b+b²____________a = 7a – InterviewSolution

1.

(7a-9b)(7a-9b) = ? using identity(a-b²)= a²-2b+b²____________a = 7a B = 9b

Answer»

Step-by-step EXPLANATION:

(7a)^2 -2(7a)(9b) +(9b)^2

49a^2 -126ab +81b^2

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