Algbrea 2 Math

Question

(2m+9n)(2m-9n)=

 

Multiply

Answer 1

This problem follows the format:  (a + b)(a - b) = a²- b²

 

The a term is 2m.

The b term is 9n.

 

Following the format:     =    a²    -    b²

                                    = (2m)²  -  (9n)²

 

The answer will be:        =  4m² - 81n²

 

Answer 2

you want to FOIL this one out to multiply! that means taking

(2m+9n)(2m-9n)

=4m^2 + 18mn - 18mn - 81n^2

=4m^2 - 81n^2