Question 279742
Hint: Rearrange the terms to get {{{(a+b)(a-b)(a^2+b^2)}}}. Now FOIL {{{(a+b)(a-b)}}} to get {{{a^2-b^2}}}. If we let {{{x=a^2}}} and {{{y=b^2}}} we then get {{{(x-y)(x+y)}}}. FOIL this and simply plug in {{{x=a^2}}} and {{{y=b^2}}}