a+2b=5 find a³+8b³+30ab
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a+2b=5 show that a+8b cube+30ab=125
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Answer:
a+2b=5 find a³+8b³+30ab
Given a+2b=5----(1)
a³+8b³+30ab=125
Cubing equation (1)
We get (a+2b)³=5³
algebraic identy:
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(X+Y)³=X³+Y³+3XY(X+Y)
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a³+8y³+6ab x 5=125
From equation(1) we get
______________
a³+8y³+30ab=125
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