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A) P(3)= 3^3- 7.3+6 = 27 -21 +6 = 12
B) R(-3)= -(-3)^2 + 4.(-3) -1 = 3^2 - 12 -1 = -4
C) P(4) - Q(1)= (4^3-7.4+6) - (2.1^3 - 1^2 + 6.4.1)
= ( 64 - 28 + 6) -(2 - 1 +24)
= 42 - 25 = 17
= el punto es un x ( multiplicación)