Question

factorise :- 0.64x^2 - 1.21y^2​

Answer 1

$0.64 {x}^{2} - 1.21 {y}^{2} \\ 0.64 = \frac{64}{100} and1.21 = \frac{121}{100} \\ \sqrt{0.64 {x}^{2} } = 0.8 \\ \sqrt{1.21} {y}^{2} = 1.1 \\ (0.8x - 1.1y)(08x + 1.1y)$

HERE IS YOUR ANSWER.