Factorisation - Which identity?

Asked by rajat951 | 21st Jul, 2009, 01:44: AM

Expert Answer:

Given 3x + 2y = 5,i.e 3x+2y-5=0 so (3x)3+(2y)3+(-5)3 = 3X3xX2yX(-5) = -90xy

i.e 27x 3+ 8y 3 + 90x y =125

we have used x + y + z=0 then x3+y3+z3=3x y z

 

Answered by  | 21st Jul, 2009, 11:03: AM

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