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If (a - b) = 4 and ab = 2 then...

This question belongs to Arithmetic Ability Algebra
Algebra
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If (a - b) = 4 and ab = 2, then (a3 - b3) is equal to:

Answer & Solution
Correct Answer: Option B
(a - b) = 4
ab = 2
(a3 - b3)
= (a - b)[(a - b)2 + 3ab]
= 4[42 + 3 × 2]
= 4[16 + 6]
= 88
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