Question

(x+2) (x-2)=? (n+m) (n-m)=? (r+9) ( r-9)=?

Answer 1

Answer:

1. (x+2) (x-2)=$x^{2}$-4

(n+m) (n-m)=$n^{2} -m^{2}$

• (r+9) ( r-9)=$r^{2}$-81

Step-by-step explanation: