As You can see from the picture on your left, when you multiply rational expressions, you first have to factor out all the numerators and denominators so they can be in simplest form. After you have done this you can cross of any factors that can cancel out. For example , the (x+2) on one fraction can cross of with the (x+2) on the other fraction; this is shown with the pink line over them. The next thing you can cross of is the (x-2) on one fraction and the (x-2) on the other fraction. The last thing you can cross of is the x on both fractions. This leaves you with x-1/x+2 as your final fraction.
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