Answer
$4x^2-3x+6$
Work Step by Step
If $P(x) = 3x+3$ and $Q(x) = 4x^2-6x+3$
$P(x) + Q(x) = 3x+3 + 4x^2-6x+3 = 4x^2-6x+3x+3+3 = 4x^2-3x+6$
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