Question

If a+b=8, ab=6,find acube+b cube

Answer 1

Given,

        a+b=8

         ab=6

To find,   a^3 + b^3

Solution: (a+b)^3 = a^3 + b^3  + 3ab(a+b)

             8^3  = a^3+b^3 + 3 *6 (8)

            512 = a^3 +b^3+ 76

            512 - 76 = a^3+b^34

           436 = a^3 + b^3   ans

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