Question

Find the product of (3x + 7y)(3x − 7y).

9x2 − 42xy + 49y2

9x2 + 42xy + 49y2

9x2 − 49y2

9x2 + 49y2

Answer 1

if you know the answer could you please explain it to me? I would like to know how..

Answer 2

9x2 − 49y2

Answer 3

9x2 − 49y2

Answer 4

(a+b)(a-b)=a^2-b^2

Answer 5

(3x + 7y)(3x − 7y).

First 3x times 3x = 9x2
Outside 3x times -7y = -21xy
Inside 3x times 7y = 21xy
Last 7y times -7y = -49y2

9 x2 - 21xy + 21xy - 49y2 = 9x2 - 49y2

Answer 6

thank you!(:

Answer 7

C