Question

a) x² - y² - 2x + 2y                                           b)2x + 2y - x² - xy   

      c) 3x² + 5x - 3xy- 5y                                       d) x² - 25 + y² + 2xy           

      e) x³ - 11 x² + 30x                                           f)   x² + 3x - 18  

 

phân tích các đa thức thành nhân tử

Answer 1

a) \(=\left(x-y\right)\left(x+y\right)-2\left(x-y\right)=\left(x-y\right)\left(x+y-2\right)\)

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

c) \(=3x\left(x-y\right)+5\left(x-y\right)=\left(x-y\right)\left(3x+5\right)\)

d) \(=\left(x+y\right)^2-25=\left(x+y-5\right)\left(x+y+5\right)\)

e) \(=x\left(x^2-11x+30\right)\)

f) \(=x\left(x-3\right)+6\left(x-3\right)=\left(x-3\right)\left(x+6\right)\)