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Popular >

sqrt(21-4x)=-x

Solution

21 - 4 x = - x

Solution

x = - 7

Solution steps

21 - 4 x = - x

Square both sides:

21 - 4 x = x^{2}

21 - 4 x = x^{2}

Solve

21 - 4 x = x^{2} : x = 3, x = - 7

x = 3, x = - 7

Verify Solutions:

x = 3

False

, x = - 7

True

The solution is

x = - 7

Graph

Popular Examples

x^{\frac{2}{3}} = 49

(x-2)^{2/3}+5=9

(x - 2)^{\frac{2}{3}} + 5 = 9

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

x^{3} - 2 x = x

\sqrt[4]{3x^2+54}=x

4 3 x^{2} + 54 = x

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

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

Frequently Asked Questions (FAQ)

What is the answer to sqrt(21-4x)=-x ?
The answer to sqrt(21-4x)=-x is x=-7
Solve for x: sqrt(21-4x)=-x
The solution is x=-7