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If a + b = 5 and ab = 3 then...

This question belongs to Arithmetic Ability Algebra
Algebra
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If a + b = 5 and ab = 3, then (a3 + b3) is equal to:

Answer & Solution
Correct Answer: Option C
a + b = 5, ab = 3
(a3 + b3) = (a + b)[(a + b)2 - 3ab]
= 5[52 - 3 × 3]
= 5(25 - 9)
= 80
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