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Popular >

x^2-4x-21<0

Solution

x^{2} - 4 x - 21 < 0

Solution

- 3 < x < 7

+1

Interval Notation

(- 3, 7)

Solution steps

x^{2} - 4 x - 21 < 0

Factor

x^{2} - 4 x - 21 : (x + 3) (x - 7)

(x + 3) (x - 7) < 0

Identify the intervals

- 3 < x < 7

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Frequently Asked Questions (FAQ)

What is x^2-4x-21<0 ?
The solution to x^2-4x-21<0 is -3<x<7