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Popular >

sqrt(x+21)=x-21

Solution

x + 21 = x - 21

Solution

x = 28

Solution steps

x + 21 = x - 21

Square both sides:

x + 21 = x^{2} - 42 x + 441

x + 21 = x^{2} - 42 x + 441

Solve

x + 21 = x^{2} - 42 x + 441 : x = 28, x = 15

x = 28, x = 15

Verify Solutions:

x = 28

True

, x = 15

False

The solution is

x = 28

Popular Examples

solvefor x,y=5x^{2/3}solve for

x, y = 5 x^{\frac{2}{3}}

sqrt(9+(2-x)^2)=5

9 + (2 - x)^{2} = 5

2 x = 2 x - 12

sqrt(6u-3)=sqrt(8u-15)

6 u - 3 = 8 u - 15

sqrt(2x)-sqrt(3)=sqrt(5)

2 x - 3 = 5

Frequently Asked Questions (FAQ)

What is the answer to sqrt(x+21)=x-21 ?
The answer to sqrt(x+21)=x-21 is x=28
Solve for x: sqrt(x+21)=x-21
The solution is x=28