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En todas, se aplica el Teorema del Resto
P(x) = x^2 + 3x - 15 por x - 4?
x - 4 = 0
x = 4
P(4) = 4^2 + 3.4 - 15
= 8 + 12 - 15
= 5
P(4) ≠ 0 NO ES DIVISIBLE
Q(x) = x^2 + 3x - 15, divisible por x-3?
x - 3 = 0
x = 3
Q(3) = 3^2 + 3.3 - 15
= 9 + 9 - 15
= 3
Q(3) ≠ 0 NO ES DIVISIBLE
R(x) = 2x^2 - 5x - 6 ,divisible por x - 3?
x - 3 = 3
R(3) = 2.(3)^2 - 5.3 - 6
= 18 - 15 - 6
= - 3
R(3) ≠ 0 NO ES DIVISIBLE