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Stells [14]
4 years ago
13

David is 38 years old and his son Frank is 8. In how many years will David be twice as old as Frank?

Mathematics
1 answer:
Brut [27]4 years ago
6 0
22 years.
38+22=60
8+22=30
60 divided by 2 = 30
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=====================================================

Work Shown:

To find the inverse, we swap x and y, then solve for y.

y = \frac{1}{4}x^3 - 2\\\\x = \frac{1}{4}y^3 - 2\\\\x+2 = \frac{1}{4}y^3\\\\4(x+2) = y^3\\\\4x+8 = y^3\\\\y^3 = 4x+8\\\\y = \sqrt[3]{4x+8}\\\\

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Side note:

If f(x) = \frac{1}{4}x^3 - 2 and g(x) = \sqrt[3]{4x+8}, then f(g(x)) = x and g(f(x)) = xfor all x values in the domain. Effectively, you use function composition to confirm that we have the correct inverse equation.

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