16Hit1600
Advanced MathVery hardSum of cubes from a sum and a product

Advanced Math practice question

If a + b = 7 and ab = 10, what is the value of a³ + b³?

Answer: 133

a³ + b³ = (a + b)³ − 3ab(a + b) = 343 − 3(10)(7) = 133.

Common wrong answers

If you answered 29
29 is a² + b².
If you answered 273
273 subtracts 70 instead of 210.
If you answered 343
343 is (a + b)³ without the correction.

More Advanced Math questions

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