d] a=-3 b=-8
bo
Q[x]=x^4+[a+3]x^3+bx^2+16=x^4+[-3+3]x^3-8x^2+16=x^4+0*x^3-8x^2+16=
x^4-8x^2+16
P[x]=x^4-8x^2+16
czyli
Q[x]=P[x]
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d] a=-3 b=-8
bo
Q[x]=x^4+[a+3]x^3+bx^2+16=x^4+[-3+3]x^3-8x^2+16=x^4+0*x^3-8x^2+16=
x^4-8x^2+16
P[x]=x^4-8x^2+16
czyli
Q[x]=P[x]