Question

Factorise using identity and divide. -15ab(a² - 18a + 81) by 5b(a - 9)​

Answer 1

[-15ab(a² - 18a + 81)] / [5b(a - 9)]

[-15ab(a² - 2*9*a + 81)] / [5b(a - 9)]

• (a - b)² = a² - 2ab + b²

[-15ab(a - 9)²] / [5b(a - 9)]

[-15ab(a - 9)(a - 9)] / [5b(a - 9)]

[-15ab(a - 9)] / [5b]

-3a(a - 9)

-3a² + 27a

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