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Mathematics

Factorise the following:

a4 - 11a2 + 10

Factorisation

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Answer

Factorising we get,

a4 - 11a2 + 10 = a4 - 10a2 - a2 + 10.

= a2(a2 - 10) - 1(a2 - 10)

= (a2 - 10)(a2 - 1)

= (a2 - 10)(a - 1)(a + 1)

Hence, a4 - 11a2 + 10 = (a2 - 10)(a - 1)(a + 1).

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