Question

If x^2 = 40, what is the value of x? ±80 ±20 plus or minus square root 80 plus or minus square root 40

Answer 1

Explanation:

x^2 = 40

To find the value of x you must take the square root of both x^2 and 40.

When you do, you get

sqrt(x^2) = sqrt(40)

Answer x = + sqrt(40)

Simplification

x = + sqrt(2 * 2 * 2 * 5)

The square root of 2 equal primes is one of them. That root can be shown outside the root sign.

x = + 2*sqrt( 2 * 5)