Make the subject of .
Use inverse operations to isolate .
Square both sides.
Add to both sides.
Divide both sides by .
Square root both sides.
The equation is fully correct as it is and will gain full marks, however the two sides can be swapped if preferred. Remember that when you square root you get two answers (a positive and a negative).
Rearrange the formula to make the subject.
Get rid of the fraction by multiplying both sides by the expression on the denominator.
Expand the brackets on the left hand side to 'release' the .
Bring the terms containing to one side of the equals sign and any other terms to the other side.
Factorise the left-hand side to bring outside of the brackets, so that it appears only once.
Isolate by dividing by the whole expression .