Question

please factorise this

Answer 1

here is your answer
${9x}^{2} - ( {x}^{2} - 4 {)}^{2} \\ {9x}^{2} - ( {x}^{2} - {2}^{2} {)}^{2} \\ (3x {)}^{2} - ( {x}^{2} - {2}^{2} {)}^{2} \\ (3x - {x}^{2} + 4)(3x + {x}^{2} - 4)$
hope this helps you