Question

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

9x2 − 42xy + 49y2

9x2 + 42xy + 49y2

9x2 − 49y2

9x2 + 49y2

Answer 1

help!

Answer 2

you see that they have different operations in the middle?

Answer 3

yeah

Answer 4

the terms are called conjugates, just math terminology. It is a good thing to note, that the product of conjugates gives us a difference between 2 squares.\[(a+b)(a-b)=a^2-b^2\]

Answer 5

there is only one option that conforms to that setup

Answer 6

ok which one