Question

Phân tích đa thức thành nhân tử:

a,x² + xy + 5x + 5y

b,xy - x² - 3y + 3x

c,2x³ - 6x³ + 18x

d, x² - 4x - 4y² + 4

e, x² - 10x + 9

f, 4x² - 4x - 3 

 

Answer 1

\(a,=x\left(x+y\right)+5\left(x+y\right)=\left(x+5\right)\left(x+y\right)\\ b,=x\left(y-x\right)-3\left(y-x\right)=\left(x-3\right)\left(y-x\right)\\ c,=18x-4x^3=2x\left(9-2x^2\right)\\ d,=\left(x-2\right)^2-4y^2=\left(x-2y-2\right)\left(x+2y-2\right)\\ e,=x^2-x-9x+9=\left(x-1\right)\left(x-9\right)\\ f,=4x^2-6x+2x-3=\left(2x-3\right)\left(2x+1\right)\)