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Question
a + b = 10, ab = 24 ∴ a3 + b3 = ______.
Options
280
270
1720
520
MCQ
Fill in the Blanks
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Solution
a + b = 10, ab = 24 ∴ a3 + b3 = 280.
Explanation:
a3 + b3 = (a + b)3 − 3ab(a + b)
= 1000 − 3(24) (10)
= 1000 − 720
= 280
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