Question 118178
It looks like you have to solve for x which really means that you have to find the value of x that, when squared and multiplied by 5, gives the result of 100.

Here's how you would do this:
{{{5x^2 = 100}}} First, divide both sides by 5 to isolate the {{{x^2}}}.
{{{(5x^2)/5 = 100/5}}} or...
{{{x^2 = 20}}} Now take the squrae root of both sides.
{{{x = sqrt(20)}}} The right side can be simplified but cannot give you an exact number because the {{{sqrt(20)}}} is irrational.
{{{x = sqrt(4*5)}}} or...
{{{x = sqrt(4)*sqrt(5)}}} Taking the square root of 4 (that's +2 or -2) you get...
{{{x = 2sqrt(5)}}} or {{{x = -2sqrt(5)}}}