If \( P=3 x^{3}-5 x+9, Q=4 x^{3}+5 x^{2}-11 \) and \( R=5 x^{3}+4 x^{2}-3 x+7 \), then \( P-2 Q+...

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If \( P=3 x^{3}-5 x+9, Q=4 x^{3}+5 x^{2}-11 \) and \( R=5 x^{3}+4 x^{2}-3 x+7 \), then \( P-2 Q+R \) is
(a) \( 2\left(3 x^{2}+4 x-19\right) \)
(b) \( -6 x^{2}-5 x+38 \)
(c) \( -2\left(3 x^{2}+4 x+19\right) \)
(d) \( -2\left(3 x^{2}+4 x-19\right) \)
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