Answer :

BrainLifting

Answer:

[tex]M-N=8x^2+11x-9\\[/tex]

Step-by-step explanation:

[tex]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\\[/tex]

FelixEgg

Answer:

8x^2+11x^2-9

Step-by-step explanation:

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

7x-(-4x)=11x

-4-5=-9

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