Question

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

Answer 1

go through the solution step by step

Answer 2

Given 5x - 2y = 7 and xy = 2

(5x+2y)2 = ( 5x - 2y)2 + 4× 5x × 2y)(5x+2y)2 
= 49 + 40 x 2
= 129.