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p(4) = 64 - 16k + 4k + 1 = 0
k = 65/12
P(x)=x3 - kx2 + kx + 1
Entonces P(4)=0
0=4^3 - k*4^2 + k*4 + 1
0=64 - 16*k + 4*k + 1
0=65 - 12*k
12*k=65
k=5.42