Question

If 5x-2y=7 and xy=2,find the value of (5x+2y) 2

Answer 1

5x-2y=7----(1)
xy = 2 ------(2)

(5x+2y)^2 = (5x -2y)^2 + 4* 5x*2y

since
(a+b)^2 = (a-b)^2 + 4ab


= 7^2 + 4*10*xy feom (1)and(2)
=49+40*2

=49+80
=129

Answer 2

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