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Popular >

x^2>= 4x+21

Solution

x^{2} \geq 4 x + 21

Solution

x \leq - 3 or x \geq 7

+1

Solution steps

x^{2} \geq 4 x + 21

Rewrite in standard form

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

Factor

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

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

Identify the intervals

x \leq - 3 or x \geq 7

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x^{2} + 15 x + 54

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(a + b + c) - (a - b + c - d)

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25 k^{2} - 16

Frequently Asked Questions (FAQ)

What is x^2>= 4x+21 ?
The solution to x^2>= 4x+21 is x<=-3\lor x>= 7