Q375
If (a - b) = 4 and ab = 2, then (a3 - b3) is equal to:
A.
92
B.
88
AnswerC.
84
D.
80
Answer: Option B
Solution
Answer: Option B
Solution:
(a - b) = 4ab = 2
(a3 - b3)
= (a - b)[(a - b)2 + 3ab]
= 4[42 + 3 × 2]
= 4[16 + 6]
= 88