SOLUTION: I need to know how to sovle (x-11)(x+11) and to show my work.

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: I need to know how to sovle (x-11)(x+11) and to show my work.      Log On


   

Question 33763: I need to know how to sovle (x-11)(x+11) and to show my work.
Answer by Cintchr(481) About Me  (Show Source):
You can put this solution on YOUR website!
+%28x-11%29%28x%2B11%29+
Using FOIL .... find the products and then add
F: +x+%2A+x+=+x%5E2+
O: +x+%2A+11+=+11x+
I: +x+%2A+-11+=+11x+
L: +-11+%2A+11+=+-121+
Add
+x%5E2+%2B11x-11x-121+
Combine like terms
+x%5E2+-+121+
ANY two binomials, when they are the EXACT sam numbers and one of the signs is positive and the other is negative, is considered a special product. This one being the difference of two squares, and it will always come back into this form:
+x%5E2+-+y%5E2+=+%28x-y%29%28x%2By%29+
Memorize this pattern