if M=5x^2+7x-4 anc N=-3x^2-4x+5, then M-N equals?

Answer:[tex]8x^{2}+11x-9[/tex]Step-by-step explanation:we have[tex]M=5x^{2}+7x-4[/tex][tex]N=-3x^{2}-4x+5[/tex]Find M-Nsubstitute[tex](5x^{2}+7x-4)-(-3x^{2}-4x+5)[/tex][tex]5x^{2}+7x-4+3x^{2}+4x-5)[/tex]Group terms [tex](5x^{2}+3x^{2})+(7x+4x)+(-4-5)[/tex]Combine like terms[tex](8x^{2})+(11x)+(-9)[/tex][tex]8x^{2}+11x-9[/tex]