If a - b = 5 and ab = 6, then $$(a^3 - b^3)$$ is equal to:
a - b = 5
$$(a - b)^2 = a^2 + b^2 - 2ab = 25$$
$$a^2 + b^2$$=37
$$a^3 - b^3=(a -b) (a^2 +ab +b^2)$$
=>$$5 \times (37 + 6)$$ = 215
So , the answer would be option d)215.Â
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