SOLUTION: (x-9) (x-9)= x2-81 -how did you find the factors of x2-81?

Algebra ->  College  -> Linear Algebra -> SOLUTION: (x-9) (x-9)= x2-81 -how did you find the factors of x2-81?      Log On


   

Question 623380: (x-9) (x-9)= x2-81
-how did you find the factors of x2-81?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
(x-9) (x-9)= x2-81
-how did you find the factors of x2-81?
-------------
Use ^ for exponents, shifted 6.
-----
(x-9)*(x-9) is not x^2-81
%28x-9%29%2A%28x-9%29+=+x%5E2+-+18x+%2B+81
---
x%5E2-81+=+%28x-9%29%2A%28x%2B9%29