Question

Use a suitable identity to get each of the following products:
(7a – 9b) (7a – 9b)
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Answer 1

Answer:

14a - 18b is the answer of this question

Answer 2

$(7a - 9b)^{2} = (7a)^{2} + {(9b)}^{2} + 2(7a)(9b) \\ = 49 {a}^{2} + 81 {b}^{2} + 126ab$