# Thread: calling all X hunters. Is x undefined?

1. ## calling all X hunters. Is x undefined?

solve for x

(squareroot of 3 - (squareroot of x + 5)) = 2

**the squaroot of 3 - is also covering the squareroot of x + 5

3. Originally Posted by needhelp75
solve for x

(squareroot of 3 - (squareroot of x + 5)) = 2

**the squaroot of 3 - is also covering the squareroot of x + 5
Is the equation $\sqrt{3 - \sqrt{x + 5}} = 2$ ?

If so, simple substitution shows that x = -4 is not the answer. In fact, there is no answer if x is a real number.
Originally Posted by needhelp75

4. yes that is the correct equation.
I've tried solving for x and got -4 but when i plug back into equation the numbers dont match.
Hence, is this equation undefined?

5. Originally Posted by needhelp75
yes that is the correct equation.
I've tried solving for x and got -4 but when i plug back into equation the numbers dont match.
Hence, is this equation undefined?
Originally Posted by mr fantastic
Is the equation $\sqrt{3 - \sqrt{x + 5}} = 2$

[snip] there is no answer if x is a real number.
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