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

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If (a - b) = 4 and ab = 2, then (a³ - b³) is equal to:

A. 92

B. 88

C. 84

D. 80

Answer: Option B

(a - b) = 4
ab = 2
(a³ - b³)
= (a - b)[(a - b)² + 3ab]
= 4[4² + 3 × 2]
= 4[16 + 6]
= 88

This Question Belongs to Arithmetic Ability >> Algebra

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