Question

15х + 10y; a2 – ab; n(7-m) + k(7–m); 8m2n – 4mn3 ; a(b-c)+3(c-b).

Answer 1

1.5(3х+2у)

2.a*(2-b)

3.(7-m)*(n+k)

4.16mn-12mn=4mn

5.(b-c)*(a-3)

Answer 2

It looks like you've provided several mathematical expressions. I can help you simplify or explain them if you'd like. Here are the simplifications for each of the expressions you provided:

1. 15x + 10y: This is a simple expression. It can be simplified by factoring out the common factor of 5: 5(3x + 2y)

2. a^2 - ab: You can factor out the common factor of "a" from both terms: a(a - b)

3. n(7 - m) + k(7 - m): Both terms have a common factor of (7 - m). You can factor that out: (7 - m)(n + k)

4. 8m^2n - 4mn^3: You can factor out the common factor of 4mn: 4mn(2mn - n^2)

5. a(b - c) + 3(c - b): First, distribute the -1 in the second term to get: a(b - c) - 3(b - c)

   Now, you can factor out the common factor of (b - c): (b - c)(a - 3)

If you have any specific questions or need further clarification on any of these expressions, please let me know.