This is a lesson of DOS ( Difference of squares) involving a common factor. Our goal with a question like this is to have two identical binomials that equal what we started with if we evaluated. All you need to do with this question is distribute x squared into two brackets and then find what times what ( YxY) equals – 100. The answer is +10 and -10.

For week 9 I learned who to factor trinomials that have a GCF.

It may look tricky to some but finding a common number that can fit into all the numbers makes it so it is extremely easy. If we have 24, 12 and 36 as our numbers we can all see they have something in common, a 12. You then distribute 12 into each number. 24/12 = 2 12/12= 1 OR x and 36/12 = 3. Now you must rage the equation to have brackets and a 12 in front of the first set of brackets because that is what you distributed.