Question

Phân tích đa thức thành nhân tử:

a) xy + y2 – x – y

b) 25 – x2 + 4xy – 4y2

c) 4x3 + 4xy2 + 8x2y – 16x

d) (x2 + x)2 + 4(x2 + x) – 12

e) (x + 1) (x + 2) (x + 3) (x + 4) - 24 g)  

h) x2 – 5x + 4

i) x4 – 5x2 + 4

j) x3 – 2x2 + 6x – 5

k) x2 – 4x + 3

Answer 1

a: \(=x\left(x+y\right)-\left(x+y\right)=\left(x+y\right)\left(x-1\right)\)

b: \(=25-\left(x-2y\right)^2\)

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