If a + b = 8, ab = 10, then the value of a3 + b3 is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 272
a + b = 8,
We know that, (a + b)3 = a3 + b3 + 3ab(a + b)
on cubing both side we get,
(a + b)3 = 83
a3 + b3 + 3ab(a + b) = 512
a3 + b3 = 512 - 240
a3 + b3 = 272