Solution
$$(a - b)^2 = a^2 + b^2 - 2ab$$
$$a^2 + b^2 = 16 + 4 = 20$$
$$(a^3 - b^3) = (a - b)(a^2 + ab + b^2)$$
= 4 (20 + 2) = 88
So, the answer would be option b)88.
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