SOLUTION: 4x2 – 81y2 A. (2x + 9)(2x – 9) B. (2x + 9y)(2x – 9y) C. (2x + 9y)2 D. (2x – 9y)2 Thank you!

Algebra ->  Expressions-with-variables -> SOLUTION: 4x2 – 81y2 A. (2x + 9)(2x – 9) B. (2x + 9y)(2x – 9y) C. (2x + 9y)2 D. (2x – 9y)2 Thank you!      Log On


   

Question 619743: 4x2 – 81y2
A.
(2x + 9)(2x – 9)
B.
(2x + 9y)(2x – 9y)
C.
(2x + 9y)2
D.
(2x – 9y)2
Thank you!
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

4x%5E2+%96+81y%5E2

factoring

(2x + 9y)(2x - 9y)

Checking with FOIL

F	First terms  4x^2

O	Outside terms -18xy

I	Inside terms  +18xy

L	Last terms    -81y^2