You multiply by the conjugate to both the denominator and numerator. After that you can simplify by canceling the 4 and then you are able to simplify the (h) as well.
Step-by-step explanation: This is an important way of solving quadratic equations. The first step of factorising an expression is to 'take out' any common factors which the terms have. So if you were asked to factorise x² + x, since x goes into both terms, you would write x(x + 1)
