(5-7b)^3+(9c-5a)^3+(7b-9c)^3
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sru8:
it must be (5a- 7b)
and not (5-7b)
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u have to use identity of a^3+b^3+c^3=3
abc
but before you have to prove that a + b + C is equal to zero
and by the terms
you can already see that all the terms of cancelling themselves so you will receive that a + b + C is equal to zero
then you can use identity of a cube plus b cube plus c cube is equal to 3 ABC..
abc
but before you have to prove that a + b + C is equal to zero
and by the terms
you can already see that all the terms of cancelling themselves so you will receive that a + b + C is equal to zero
then you can use identity of a cube plus b cube plus c cube is equal to 3 ABC..
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