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The sum of three numbers is 14 and the sum of their squares is 100. Find the sum of cubes of those three numbers if their product is 24.radio_button_unchecked728radio_button_unchecked936radio_button_unchecked733radio_button_unchecked800

Question

The sum of three numbers is 14 and the sum of their squares is 100. Find the sum of cubes of those three numbers if their product is 24.radio_button_unchecked728radio_button_unchecked936radio_button_unchecked733radio_button_unchecked800

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Solution

This problem can be solved using the formula for the sum of cubes, which is (a+b+c)³ = a³ + b³ + c³ + 3ab(a+b) + 3bc(a+c) + 3ca(b+c).

Given that a+b+c = 14, a²+b²+c² = 100, and abc = 24, we can substitute these values into the formula to find the sum of the cubes.

First, we need to find the value of 3ab(a+b) + 3bc(a+c) + 3ca(b+c).

This can be simplified to 3abc + 3ab² + 3bc² + 3ca².

We know that abc = 24, so 3abc = 72.

We also know that a²+b²+c² = 100, so 3ab² + 3bc² + 3ca² = 300.

Therefore, the sum of the cubes is a³ + b³ + c³ + 72 + 300 = 372 + a³ + b³ + c³.

We can find the value of a³ + b³ + c³ by subtracting 372 from the total sum of the cubes.

The sum of the cubes is therefore 372 + 24 = 396.

So, the sum of the cubes of the three numbers is 396.

This problem has been solved

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