Question

Factorise the following 2x² - 162​

Answer 1

2(x - 9)(x + 9)

Explanation:

2x ^ 2 - 162

2 (x ^ 2 - 81)

2 (x ^ 2 - 9x - 9x - 81)

2 [x(x + 9) - 9(x + 9)]

2(x - 9)(x + 9)

Answer 2

⇨ 2x² - 162

⇨ 2 ( x² - 81 )

⇨ 2 ( x² - 9x - 9x - 81 )

⇨ 2 { x ( x + 9 ) - 9 ( x + 9 ) }

⇨ 2 ( x - 9 ) ( x + 9 )