Question

If a+b=11,a^2+b^2=61 ,find a^3+b^3

Answer 1

that's the answer for your question
sorry wrong formula
it's -ab
therfore it will be
11(61-30)
11×31
341

Answer 2

a^3+b^3 = (a+b)(a^2+b^2-ab)
=11×31
=341