Factorisation of the expression $- 15 x + 5 x^{3}$ gives result as

5 x (3 - x^{2})

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5 x (x^{2} - 3)

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- 5 x (x^{2} - 3)

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x (x^{2} - 3)

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Solution

The correct option is B $5 x (x^{2} - 3)$
$- 15 x + 5 x^{3} = (- 5 \times 3 \times x) + (5 \times x \times x \times x)$
$= - 5 x (3 - x^{2})$
$= 5 x (x^{2} - 3)$

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