Question

answer 4 th question

Answer 1

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_Here Is Your Answer_

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169

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Answer 2

(5x - 2y)^2 = (5x)^2 + (2y)^2 -2.5x.2y
(7)^2 = (5x)^2 + (2y)^2 -20xy

49 = (5x)^2 + (2y)^2 -20 (3)

49 +60 = (5x)^2 +(2y)^2
109 = (5x)^2 + (2y)^2
(5x + 2y)^2 = (5x)^2 + (2y)^2 + 2.5x.2y
=109 + 60
=169
(a) option