Question

Factorise (2a – 3b)^2?​

Answer 1

${(2a - 3b)}^{2} \\ (x - {y)}^{2} = {x}^{2} + {y}^{2} - 2xy \\ ( {2a - 3b)}^{2} = {(2a)}^{2} + {(3b)}^{2} - 2 \times 2a \times 3b \\ = 4 {a}^{2} + 9 {b}^{2} - 12ab$