Phân tích đa thức sau thanh nhân tử
x4+2019x2+2018x+2019
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\(x^4+4\)
= \(\left(x^2+2\right)^2-4x^2\)
= \(\left(x^2-2x+2\right)\left(x^2+2x+2\right)\)
\(x^3+2018x^2-2018x+2019\)
\(=\left(x^3+2019x^2\right)-\left(x^2+2019x\right)+\left(x+2019\right)\)
\(=x^2\left(x+2019\right)-x\left(x+2019\right)+\left(x+2019\right)\)
\(=\left(x+2019\right)\left(x^2-x+1\right)\)
Tham khảo nhé~
a, =x4-x + 2019x2+2019x+2019
=x(x3-1)+2019(x2+x+1)
=x(x-1)(x2+x+1)+2019(x2+x+1)
=(x2-x+2019)(x2+x+1)
b, =(x-y+y-z)[(x-y)2-(x-y)(y-z)+(y-z)2 ] + (z-x)3
=(x-z)(x2-2xy+y2-xy+xz+y2-yz+y2-2yz+z2) - (x-z)3
=(x-z)(x2-2xy+y2-xy+xz+y2-yz+y2-2yz+z2-x2+2xz-z2)
=(x-z)(-3xy+3y2+3xz-3yz)
=3(x-z)(-xy+y2+xz-yz)
=3(x-z)[(-xy+xz)+(y2-yz)]
=3(x-z)[-x(y-z)+y(y-z)]
=3(y-x)(x-z)(y-z)
\(x^4+2019x^2+2018x+2019\)
\(=x^4-x^3+x^3+2019x^2-x^2+x^2+2019x-x+2019\)
\(=\left(x^4-x^3+2019x^2\right)+\left(x^3-x^2+2019x\right)+\left(x^2-x+2019\right)\)
\(=x^2\left(x^2-x+2019\right)+x\left(x^2-x+2019\right)+\left(x^2-x+2019\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+2019\right)\)