Question

Pls pls help!! i will mark you as brilliant!!

Answer 1

8x^2+11x^2-9

Explanation:

5x^2-(-3x^2)=8x^2

7x-(-4x)=11x

-4-5=-9

Answer 2

`M-N=8x^2+11x-9\\`

Explanation:

`We\ are\ given\ that:\\M=5x^2+7x-4\\N=-3x^2-4x+5\\\\Hence,\\M-N=5x^2+7x-4-(-3x^2-4x+5)\\M-N=5x^2+7x-4+3x^2+4x-5\\M-N=5x^2+3x^2+7x+4x-4-5\\M-N=8x^2+11x-9\\`