Question

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

Answer 1

(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.

Answer 2

Thx. Perfect sense.

Answer 3

how to solve . . .

(3x^3+2x-4) (2x^2-6x+7)

Answer 4

(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.