what is the simplified form of (3x+1)(3x-1)

Question

anonymous · Answer

(3x+1)(3x-1) 
9x^2 -3x+3x -1 
The 3x's cancel 
9x^2-1 
If you use the F.o.i.l method this will be your answer.

anonymous · Answer

Thx.  Perfect sense.

anonymous · Answer

how to solve . . . 

(3x^3+2x-4) (2x^2-6x+7)

anonymous · Answer

(3x^3+2x-4)(2x^2-6x+7)
This can be done many ways. You can either break down each problem into smaller factors like the problem before or you can foil them and 
After you first foil you will get 
6x^5 -18x^4+21x^3 +4x^3 -12x^2 -8x^2+14x+24x-28 (I have moved these around to make them easier to see)
Then you combine like terms and you should come up with 
6x^5-18^4 +25^3 -20x^2 +38x-28.