Question

Pt đa thức thành nhân tử 
d)8xy^2-5xyz-24y^2+15z
e)x^4-x^3-x+1
f)x^4+x^2y^2+y^4
g)x^3+3x-4
h)x^3-3x^2+2
i)2x^3+x^2-4x-12
k)25x^2(x-y)-x+y

Answer 1

d) mk chỉnh lại đề

  \(8xy^2-5xyz-24y+15z\)

\(=xy\left(8y-5z\right)-3\left(8y-5z\right)\)

\(=\left(8y-5z\right)\left(xy-3\right)\)

e)   \(x^4-x^3-x+1=\left(x-1\right)^2\left(x^2+x+1\right)\)

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

g)  \(x^3+3x-4=\left(x-1\right)\left(x^2+x+4\right)\)

h)   \(x^3-3x^2+2=\left(x-1\right)\left(x^2-2x-2\right)\)

i)  \(2x^3+x^2-4x-12=\left(x-2\right)\left(2x^2+5x+6\right)\)

k)  \(25x^2\left(x-5\right)-x+y=\left(1-5x\right)\left(1+5x\right)\left(y-x\right)\)