SOLUTION: The problem says which of the polynomials below is NOT a difference of squares? a. 9x^2 - 49 b. x^4 - 16 c. x^3 - 81 d. 4x^2 - 25 I think the answer is b & c. Am I right?

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: The problem says which of the polynomials below is NOT a difference of squares? a. 9x^2 - 49 b. x^4 - 16 c. x^3 - 81 d. 4x^2 - 25 I think the answer is b & c. Am I right?       Log On


   

Question 870754: The problem says which of the polynomials below is NOT a difference of squares?
a. 9x^2 - 49
b. x^4 - 16
c. x^3 - 81
d. 4x^2 - 25
I think the answer is b & c. Am I right? If not please show how to work the problems so I can see how you figured it out. Thanks.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
No, only c.
b can be broken down to %28x%5E2-4%29%28x%5E2%2B4%29