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Popular >

x^2-4x-21>= 0

Solution

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

Solution

x \leq - 3 or x \geq 7

+1

Interval Notation

(- \infty, - 3] \cup [7, \infty)

Solution steps

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

Factor

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

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

Identify the intervals

x \leq - 3 or x \geq 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 x<=-3\lor x>= 7