Răspuns:
Explicație pas cu pas:
P(x) = x³-7x²+9x-5
Q(x) =x²-6x+3
1) P(x) + Q(x) = x³-7x²+9x-5 +x²-6x+3 = x³-6x²+3x-2
2) Q(x) - P(x) = x²-6x+3 - (x³-7x²+9x-5) =
= x²-6x+3 -x³+7x²-9x+5 = -x³+8x²-15x+8
3) P(x) - Q(x) = x³-7x²+9x-5 - (x²-6x+3) =
x³-7x²+9x-5 -x²+6x-3 = x³-8x²+15x-8
P(x) are gradul 3 ; Q(x) are gradul 2