Using the Factor Theorem, show that : \( (x+5) \) is a factor of \( 2 x^{3}+5 x^{2}-28 x-15 \). ...

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Using the Factor Theorem, show that :
\( (x+5) \) is a factor of \( 2 x^{3}+5 x^{2}-28 x-15 \).
Hence, factorise the expression
\( 2 x^{3}+5 x^{2}-28 x-15 \) completely.
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