To solve for the value we need to isolate it on one side of the equal sign. Let's move the on the right side to the left side by subtracting it from both sides. We then get:
Subtract from both sides of the equal sign to isolate the
To solve for we need to divide both sides by since it is being multiplied by
Whenever you have a root of sqrt #, you must have the matching - (or positive). This is because when you take a square root you get two solutions a positive and a negative. The answer is LETTER A