Question

Factorise the following: 5d⁴ - 10d³ - 20d + 40.

Answer 1

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Step-by-step explanation:

$5 {d}^{4} - 10 {d}^{3} - 20d + 40 \\ 5 {d}^{3} (d - 2) - 20(d - 2) \\ (d - 2)(5 {d}^{3} - 20)$

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