en

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

sqrt(21-3x)=x-1

Solution

21 - 3 x = x - 1

Solution

x = 4

Solution steps

21 - 3 x = x - 1

Square both sides:

21 - 3 x = x^{2} - 2 x + 1

21 - 3 x = x^{2} - 2 x + 1

Solve

21 - 3 x = x^{2} - 2 x + 1 : x = 4, x = - 5

x = 4, x = - 5

Verify Solutions:

x = 4

True

, x = - 5

False

The solution is

x = 4

Graph

Popular Examples

4=3x+sqrt(54-9x+7x^2)

4 = 3 x + 54 - 9 x + 7 x^{2}

x - 23 = 5

sqrt(8x+25)-sqrt(2x+4)=3

8 x + 25 - 2 x + 4 = 3

solvefor c,a=sqrt((b-c)/(2c)+d)solve for

c, a = \frac{b - c}{2 c} + d

\sqrt[4]{8x+12}-9=-11

4 8 x + 12 - 9 = - 11

Frequently Asked Questions (FAQ)

What is the answer to sqrt(21-3x)=x-1 ?
The answer to sqrt(21-3x)=x-1 is x=4
Solve for x: sqrt(21-3x)=x-1
The solution is x=4