Mathematics

Factorise :

7a5 - 567a

Factorisation

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Answer

7a5 - 567a

= 7a(a4 - 81)

= 7a((a2)4 - (9)4)

Using the formula

[∵ (x2 - y2) = (x + y)(x - y)]

= 7a(a2 - 9)(a2 + 9)

= 7a((a)2 - (3)2)(a2 + 9)

= 7a(a - 3)(a + 3)(a2 + 9)

Hence, 7a5 - 567a = 7a(a - 3)(a + 3)(a2 + 9)

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