Factorise $- 16 z + 20 z^{3}$

- z (4 - 5 z^{3})

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- z (4 - 5 z^{2})

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4 z (4 - 5 z^{2})

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- 4 z (4 - 5 z^{2})

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Solution

The correct option is D $- 4 z (4 - 5 z^{2})$
$- 16 z + 20 z^{3}$
$= - 4 \times 4 \times z + 4 \times 5 \times z \times z \times z$
$= 4 z (5 z^{2} - 4)$

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Similar questions

Factorise the polynomial $14 (3 y - 5 z)^{3} + 7 (3 y - 5 z)^{2}$

(a) 6 p (p - 3) + 1 (p - 3)

(b) 14 (3 y - 5 z)^{3} + 7 (3 y - 5 z)^{2}

The given expression: 2s²+3r+5u² +10p+6r+7s², on simplification gives:

(3 x + 4 y + 5 z)^{2}

(2 x + 3 y + 5 z)^{2}

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