Question

x-2y-x^2+4y^2 by using the formulae a^2-b^2​

Answer 1

AnSwer :-

$\\ x - 2y - {x}^{2} + 4 {y}^{2} \\ \\ = x - {x}^{2} + 4 {y}^{2} - 2y \\ \\ = (x - 2y) - ( {x}^{2} - 4 {y}^{2} ) \\ \\ = (x - 2y) - (x - 2y)(x + 2y) \\ \\ = (x - 2y) \times (1 - (x + 2y)) \\ \\ = (x - 2y) \times (1 - x - 2y)$