Question

  

Answer 1

3:

2: f(-2)=4

=>4m-4+16=4

=>4m+12=4

=>m+3=1

=>m=-2

1:

a: H(x)=x^3+3x^2+3x-2-x^3-x^2-5x+2

=2x^2-2x

P(x)-Q(x)

=x^3+3x^2+3x-2+x^3+x^2+5x-2

=2x^3+4x^2+8x-4

b: H(x)=0

=>2x(x-1)=0

=>x=0 hoặc x=1