Find the value of \( a \), if \( (x+2) \) is a factor of the polynomial \( f(x)=x^{3}+13 x^{2}+a...

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Find the value of \( a \), if \( (x+2) \) is a factor of the polynomial \( f(x)=x^{3}+13 x^{2}+a x+20 \)
(a) \( -15 \)
(b) 20
(c) 25
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