solve the problem immediately plz
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(5x-2y)²=(5x²)+(2y²)-2*5x*2y
7²=25x²+4y²-20xy
49=25x²+4y²-20*2
49-40=25x²+4y²
25x²+4y²=9
NOW
(5x+2y)²=25x²+4y²+2*5x*2y
(5x+2y)²=9+20xy
(5x+2y)²=9+40
(5x+2y)²=49
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