Question

What is (3xy-2b)(3xy+2b)

Answer 1

hint:
(a-b)*(a+b)=a^2-b^2

Answer 2

a=3xy
b=2b

Answer 3

9xy-4b???
Totally illiterate by the way....😰😂

Answer 4

You multiplied the numbers correctly, and you got the sign correct.
You also need to multiply the variables.

\((3xy-2b)(3xy+2b)\)

\(= (3xy)^2 - (2b)^2\)

\(= 3xy \times 3xy - 2b \times 2b\)

\(= 3^2 x^2 y^2 - 2^2 b^2\)

\(=9x^2y^2 - 4b^2\)

Answer 5

Aww- thank you!!

Answer 6

You're welcome.