1) Simplify :- (5x + 3y)3 – (5x – 3y )3
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Answer:
(5x+3y)3-(5x-3y)3
(3*5x+3*3y)-(3*5x-3*3y)
(15x+9y)-(15x-9y)
15x+9y-15x+9y
15x-15x+9y+9y
0+18y
= 18y
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