Tính \(P \left( x \right) - Q \left( x \right) \) .
A.\(\begin{array}{l}\,P\left( x \right) - Q\left( x \right) = 3{x^2} + x\end{array}\)
B.\(\begin{array}{l}\,P\left( x \right) - Q\left( x \right) = 2{x^2} + x\end{array}\)
C.\(\begin{array}{l}\,P\left( x \right) - Q\left( x \right) = -3{x^2} + x\end{array}\)
D.\(\begin{array}{l}\,P\left( x \right) - Q\left( x \right) = 3{x^2} - x\end{array}\)
A.\(\begin{array}{l}\,P\left( x \right) - Q\left( x \right) = 3{x^2} + x\end{array}\)
B.\(\begin{array}{l}\,P\left( x \right) - Q\left( x \right) = 2{x^2} + x\end{array}\)
C.\(\begin{array}{l}\,P\left( x \right) - Q\left( x \right) = -3{x^2} + x\end{array}\)
D.\(\begin{array}{l}\,P\left( x \right) - Q\left( x \right) = 3{x^2} - x\end{array}\)
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