Question

Giải giúp

Answer 1

a: M(x)=3x^4+8x^3+2x^2-5x-2

N(x)=x^4-5x^3+3x^2-4x+7

b: M(x)+N(x)=4x^4+3x^3+5x^2-9x+5

M(x)-N(x)=2x^4+13x^3-x^2-x-9

c: B(x)=0

=>x+6=0

=>x=-6