en

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

x^2-4x-21<0

Solution

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

Solution

- 3 < x < 7

+1

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

Popular Examples

simplify sqrt(e^x)simplify

e^{x}

simplify 2/3 (9)simplify

\frac{2}{3} (9)

simplify (27a^3-1)/(9a^2-6a+1)simplify

\frac{27 a ^{3} - 1}{9 a ^{2} - 6 a + 1}

2 x + 4 = - 16

simplify 4^{-5/2}simplify

4^{- \frac{5}{2}}

Frequently Asked Questions (FAQ)

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