Question

factorise 9x^2-x^2-4y^2+4xy​

Answer 1

Step-by-step explanation:

$9x ^{2} - x {}^{2} - 4y {}^{2} + 4xy \\ 8x { }^{2} - 4 {y}^{2} + 4xy$

Answer 2

Step-by-step explanation:

$9{x}^{2} - {x}^{2} - {4y}^{2} + 4xy$

$8 {x}^{2} - 4 {y}^{2} + 4xy$