If the HCF of \( x^{3}+2 x^{2}-a x \) and \( 2 x^{3}+5 x^{2}-3 x \) is \( x(x+3) \), then \( a= ...

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If the HCF of \( x^{3}+2 x^{2}-a x \) and \( 2 x^{3}+5 x^{2}-3 x \) is \( x(x+3) \), then \( a= \)
(a) 3
(b) \( -3 \)
(c) 6
(d) \( -4 \)
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