Question

factorise 2x^2 - 18​

Answer 1

Answer:

${a}^{2} - {b}^{2} = (a + b)(a - b)$

$\: \: \: \: 2 {x}^{2} - 18 \\ = 2( {x}^{2} - 9) \\ = 2[ ({x})^{2} - {(3)}^{2}] \\ = 2(x + 3)(x - 3)$