Question

HELP FAST ASAP THIS IS DUE IN LESS THAN AN HOUR

Answer 1

9x²-1

Explanation:

1) (3x-1)(3x+1)

transfer difference of squares using this rule:

(a-b) (a+b) = a²-b²

2) (3x)²-1²

expand (3x)²

3) 3²x²-1²

calculate 3 to the power of 2 and 9

4) 9x²-1²

calculate 1 to the power of 2 and get 1

5) 9x²-1

you recieve your answer, B.

Answer 2

9x^2 -1

Explanation:

(3x-1) (3x+1)

FOIL

first: 3x*3x = 9x^2

outer:3x*1 =3x

inner: -1 *3x = -3x

last: -1*1 = -1

Add them together

9x^2 +3x-3x-1

Combine like terms

9x^2 -1