if a-b=5 show that a³- b³-15ab=125
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Step-by-step explanation:
a-b=5
=>a=5+b
a^3-b^3-15ab
=(5+b)^3-b^3-15(5+b)b
=125+b^3+15b(5+b)-b^3-15b(5+b)
=125
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