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(a+b)² = 1a² + 2ab + 1b²
(3a-5b) = 1 x (3a)² + 2 x 3a x -5b + 1 x (-5b)²
= 9a² - 30ab + 25b²
=9a²-15ab-15ab+25b²
=9a²-30ab+25b²