If x power of 2 = 40 what is the value of x

Question

mathstudent55 · Answer

$x^2 = 40$

Solve for x.

Is that the question?

angelina__nievse · Answer

Yes

thomas123 · Answer

take the square root of 40.?

mathstudent55 · Answer

An equation of the form

$x^2 = k$

where k is a number has the solutions

$x = \pm\sqrt k$

mathstudent55 · Answer

Take the positive and negative square roots of 40.

angelina__nievse · Answer

Ok thanks would it be 80

mathstudent55 · Answer

You may need to simplify $\sqrt {40}$ since there is a perfect square factor of 40.

mathstudent55 · Answer

No.

$\sqrt {40} $ is the number that when you square you get 40.

What number do you multiply by itself (square) to get 40?

Let's see.

6 * 6 = 36 too low
7 * 7 = 49 too high

$\sqrt {40} $ is a number between 6 and 7.

mathstudent55 · Answer

If you need an exact solution, then it is

$\sqrt {40} = \sqrt {4 \times 10} = 2 \sqrt{10}$

If you need an approximation, then 

$\sqrt {40} \approx 6.324$

Either way, remember that for your question, you need both the positive and negative square roots.

angelina__nievse · Answer

Thanks you really helped

mathstudent55 · Answer

You're welcome.