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Popular >

x^4-7x^2-18<0

Solution

x^{4} - 7 x^{2} - 18 < 0

Solution

- 3 < x < 3

+1

Interval Notation

(- 3, 3)

Solution steps

x^{4} - 7 x^{2} - 18 < 0

Factor

x^{4} - 7 x^{2} - 18 : (x^{2} + 2) (x + 3) (x - 3)

(x^{2} + 2) (x + 3) (x - 3) < 0

Identify the intervals

- 3 < x < 3

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Frequently Asked Questions (FAQ)

What is x^4-7x^2-18<0 ?
The solution to x^4-7x^2-18<0 is -3<x<3