Question

a) a^2 - b^2 -2x+ 2b

b) x^2 - xy + 2y - 4

Answer 1

a) \(a^2-b^2-2a+2b\\ =\left(a-b\right)\left(a+b\right)-2\left(a-b\right)\\ =\left(a-b\right)\left(a+b-2\right)\)

b) \(x^2-xy+2y-4\\ =\left(x^2-4\right)+\left(2y-xy\right)\\ =\left(x-2\right)\left(x+2\right)+y\left(2-x\right)\\ =\left(x-2\right)\left(x+2\right)-y\left(x-2\right)\\ =\left(x-2\right)\left(x-y+2\right)\)

Lần sau ghi đề bài chú ý ghi chuẩn nha !

Answer 2

(a-b)(a+b)-2(a-b)

(a-b)(a+b-2)

Answer 3

a) a² - b² - 2a + 2b

= (a - b)(a + b) - 2(a - b)

= (a - b)(a + b - 2)

b) x² - xy + 2y - 4

= (x - y)² - 2²

= (x - y - 2)(x - y + 2)