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Popular >

x^2-4x-21<= 0

Solution

x^{2} - 4 x - 21 \leq 0

Solution

- 3 \leq x \leq 7

+1

Interval Notation

[- 3, 7]

Solution steps

x^{2} - 4 x - 21 \leq 0

Factor

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

(x + 3) (x - 7) \leq 0

Identify the intervals

- 3 \leq x \leq 7

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x^{2} - \frac{25}{16}

Frequently Asked Questions (FAQ)

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