Question

Mulitply and Simplify
( 9 + 2v3 ) ( 9 - 2v3 )
v stands for sqrt

A.69 - 4v3
B. 81 - 4v3
C. 69

Answer 1

I think its B.

Answer 2

did you actually foil or just guess?

Answer 3

i distributed

Answer 4

it is similar to (a+b)(a-b)=a^2 -b^2
( 9 + 2v3 ) ( 9 - 2v3 ) = 9^2 - (2v3)^2 = 81 - 12=69

Answer 5

show how you distributed for your next question so your work can be checked