Given two polynomials P(x) = x3 - 2.x + 1 ,Q(x) = 2.x2-x3 + x -3.

a) Calculate P(x) + Q(x) and P(x) - Q(x)

b) Calculate the value of the polynomial P(x) + Q(x) at x = -1; x = (- 2) / 3

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