SOLUTION: Factor completely. Remember to look first for a common factor. If a polynomial is prime, state this. 16x − 81x3

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Factor completely. Remember to look first for a common factor. If a polynomial is prime, state this. 16x − 81x3       Log On


   

Question 667085: Factor completely. Remember to look first for a common factor. If a polynomial is prime, state this. 16x − 81x3
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
16x-81x%5E3

x%2816-81x%5E2%29

x%28%284%29%5E2-%289x%29%5E2%29
using the identity a%5E2-b%5E2=%28a%2Bb%29%28a-b%29
we get
x%284%2B9x%29%284-9x%29