Resposta:
P(x)=a*(x-x')*(x-x'')*(x-x''')*(x-x'''')
P(x)=a*(x+5)*(x+5)*(x -(1-i))*(x-(1+i)))
P(x)=a*(50 - 30 x + 7 x^2 + 8 x^3 + x^4)
P(2)=a*(50 -30*2+7*2^2+8*2^3+2^4)=-98
a*98=-98
a=-1
P(x)=(-1)*(50 - 30 x + 7 x^2 + 8 x^3 + x^4)
P(x)=-x^4-8x³-7x²+30x-50