What are all of the real roots of the following polynomial? f (x) = x4 - 24x2 - 25

Question

Mathematics

Amy Hobbs

10 June, 17:03

What are all of the real roots of the following polynomial? f (x) = x4 - 24x2 - 25

+5

Answers (1)

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Marley · Answer 1

It factors as ...

f (x) = (x² - 25) (x² + 1) = (x - 5) (x + 5) (x² + 1)

A root will make one of the factors equal to zero. The quadratic factor has only complex roots.

The real roots are x = ±5.