Question

A) (n +3m)(3m - n); ​

Answer 1

Ответ:

(n+3m)(3m-n)=

(3m+n)(3m-n)=

9m²-n²

Answer 2

To simplify the expression (n + 3m)(3m - n), you can use the distributive property (also known as FOIL):

(n + 3m)(3m - n) = n(3m) - n(n) + 3m(3m) - 3m(n)

Now, multiply each term:

3mn - n^2 + 9m^2 - 3mn

Notice that the terms 3mn and -3mn cancel each other out, so you're left with:

• n^2 + 9m^2

So, the simplified expression is:

• n^2 + 9m^2