Cách làm cho bạn:
N(x)−M(x)=−5$x^{4}−4x^{3}+2x^{2}$+8x
N(x)=−5$x^{4}−4x^{3}+2x^{2}$+8x+M(x)=$−5x^{4}−4x^{3}+2x^{2}$+8x+($3x^{5}−4x^{3}$+9x+2)
N(x)=3$x^{5}−5x^{4}−8x^{3}+2x^{2}$+17x+2
Q(x)+M(x)=$3x^{4}−2x^{3}+9x^{2}$−7
Q(x)=3$x^{4}−2x^{3}+9x^{2}$−7−M(x)=$3x^{4}−2x^{3}+9x^{2}$−7−($3x^{5}−4x^{3}$+9x+2)
Q(x)=−3$x^{5}+3x^{4}+2x^{3}+9x^{2}$−9x−9
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