Show that : (9a-5b) ²+180ab=(9a+5b)²
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(9a-5b)²+180ab=(9a+5b)²
(9a)²+(5b)²-2(9a)(5b)+180ab=(9a)²+(5b)²+2(9a)(5b)
81a²+25b²-90ab+180ab=81a²+25b²+90ab
81a²+25b²+90ab=81a²+25b²+90ab
(9a+5b)²=(9a+5b)²
LHS=RHS
Hence proved
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