(5a +3b)cube - (5a - 3b )cube
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the rest is simple algebraic multiplication. Hope this helps.
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hi mate,
solution: (5a+3b)³-(5a-3b)³
= (5a)³+3*(5a)²*3b+3*5a*(3b)²+(3b)³- [(5a)³-3*(5a)²*3b+3*5a*(3b)²-(3b)³]
=(5a)³+3*(5a)²*3b+3*5a*(3b)²+(3b)³-(5a)³+3*(5a)²*3b-3*5a*(3b)²+(3b)³
=2*3*(5a)²*3b+2*(3b)³
=450a²b+54b³
i hope it helps you.
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