Question

9x^2-24xy+7y^2 разложить на множители

Answer 1

Ответ:

$9 {x}^{2} - 24xy + 7 {y}^{2} = \\ (9 {x}^{2} - 24xy + 16 {y}^{2} ) - 9 {y}^{2} = \\ {(3x - 4y)}^{2} - 9 {y}^{2} = \\ (3x - 4y - 3y)(3x - 4y + 3y) = \\ (3x - 7y)(3x - y)$