Question

Giải giúp mình bài 2, cảm ơn!

Answer 1

Bài `2`

`a, P(x)=12-6x^3+9x-x^2`

`= -6x^3 -x^2 +9x+12`

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`Q(x)=4+10x^2+29x^3-6x`

`= 29x^3 +10x^2 -6x+4`

`b,P(x)+Q(x)= -6x^3 -x^2 +9x+12 + 29x^3 +10x^2 -6x+4`

`= (-6x^3+ 29x^3)+(-x^2+10x^2) +(9x -6x) +(12+4)`

`= 23x^3+ 9x^2 + 3x + 16`

`c,P(x)-Q(x)=(-6x^3 -x^2 +9x+12) - (29x^3 +10x^2 -6x+4)`

`= -6x^3 -x^2 +9x+12- 29x^3-10x^2 +6x-4`

`= (-6x^3- 29x^3 )+(-x^2-10x^2)+(9x+6x) +(12-4)`

`= -35x^3 -11x^2 + 15x + 8`

Answer 2

`2,`

`a, P(x)=12 - 6x^3+9x-x^2`

`P(x)= -6x^3 - x^2 + 9x +12`

`Q(x)=4+10x^2+29x^3-6x`

`Q(x)= 29x^3 +10x^2-6x+4`

`b, P(x)+Q(x)= (-6x^3-x^2+9x+12) + (29x^3+10x^2-6x+4)`

`P(x)+Q(x)= -6x^3-x^2+9x+12 + 29x^3+10x^2-6x+4`

`P(x)+Q(x)= (-6x^3+29x^3) - (x^2-10x^2)+(9x-6x)+(12+4)`

`P(x)+Q(x)=23x^3 + 8x^2+3x+16`

`c, P(x)-Q(x)= (-6x^3-x^2+9x+12) - (29x^3+10x^2-6x+4)`

`P(x)-Q(x)= -6x^3-x^2+9x+12 - 29x^3 - 10x^2+6x-4`

`P(x)-Q(x)= (-6x^3 - 29x^3) - (x^2+10x^2)+(9x+6x)+(12-4)`

`P(x)-Q(x)= -35x^3-11x^2+15x+8`