Solution
it is given that $$a^3 - b^3$$ = 56
we know $$a^3 - b^3 = (a-b)(a^2 + b^2 + ab)$$
a- b = 2 (Given)
hence
$$(a^2 + b^2 + ab)$$ = $$\frac{56}{2}$$ = 28
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