Do as directed:
1) Factorise the following: 5d⁴ - 10d³ - 20d + 40.
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Answer:
5(d³-4)(d-2)
Step-by-step explanation:
5[d⁴-2d³-4d+8]
=5[d³(d-2)-4(d-2)]
=5(d³-4)(d-2)
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