Question

ii) Factorise the following a³ - 23a+ 42​

Answer 1

Answer:

a(a²+19)

Step-by-step explanation:

a³-23a+42

a(a²-23+42)

a(a²+19)                                     (ans)

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Answer 2

Answer:

Step-by-step explanation:

a^3-23+42(by factorisation method )

a^3-21a-2a+42

a^2(a-21)-2(a-21)

(a^2-2)(a-21)

a=√2 , a=21