a) P(x) + Q(x) = 5x2 - 7x + 3 - 5x2 + 2x == 5x2 - 5x2 - 7x + 2x + 3 = -5x + 3
b) P(x) + R(x) = 5x2 - 7x + 3 + x3 + x2 + 2 == x3 + 5x2 + x2 - 7x + 3 + 2 = x3 + 6x2 - 7x + 5
c) Q(x) + R(x) = -5x2 + 2x + x3 + x2 + 2 == x3 - 5x2 + x2 + 2x + 2 = x3 - 4x2 + 2x + 2
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a) P(x) + Q(x) = 5x2 - 7x + 3 - 5x2 + 2x =
= 5x2 - 5x2 - 7x + 2x + 3 = -5x + 3
b) P(x) + R(x))
b) P(x) + R(x) = 5x2 - 7x + 3 + x3 + x2 + 2 =
P(x) = 5x2 - 7x + 3= x3 + 5x2 + x2 - 7x + 3 + 2 = x3 + 6x2 - 7x + 5
Q(x) = -5x2 + 2x
R(x) = x3 + x2 + 2
c) Q(x) + R(x)
c) Q(x) + R(x) = -5x2 + 2x + x3 + x2 + 2 =
= x3 - 5x2 + x2 + 2x + 2 = x3 - 4x2 + 2x + 2