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đặt y=x2+1
=>y2=(x2+1)2
y2=x4+2x2+1
đặt P(x)=x^4+6x^3+11x^2+6x+1
=x4+2x2+1+6x3+6x+9x2
=x4+2x+1+6x(x2+1)+9x2
thay y2=x4+2x2+1 và y=x2+1 ta được
Q(y)=y2+6xy+9x2
=(y+3x)2
thay y=x2+1 ta được:
(x2+3x+1)2
vậy x^4+6x^3+11x^2+6x+1=(x2+3x+1)2
`@` `\text {Ans}`
`\downarrow`
`4x^3 - 4x^2 - 9x + 9`
`= (4x^3 - 4x^2) - (9x - 9)`
`= 4x^2(x - 1) - 9(x - 1)`
`= (4x^2 - 9)(x - 1)`
____
`x^3 + 6x^2 + 11x + 6`
`= x^3 + x^2 + 5x^2 + 5x + 6x + 6`
`= (x^3 + x^2) + (5x^2 + 5x) + (6x + 6)`
`= x^2*(x + 1) + 5x(x + 1) + 6(x + 1)`
`= (x^2 + 5x + 6)(x+1)`
____
`x^2y - x^3 - 9y + 9x`
`= (x^2y - 9y) - (x^3 - 9x)`
`= y(x^2 - 9) - x(x^2 - 9)`
`= (y - x)(x^2 - 9)`
b: =x^3+x^2+5x^2+5x+6x+6
=(x+1)(x^2+5x+6)
=(x+1)(x+2)(x+3)
c: =x^2(y-x)-9(y-x)
=(y-x)(x^2-9)
=(y-x)(x-3)(x+3)
a: =(4x^3-4x^2)-(9x-9)
=4x^2(x-1)-9(x-1)
=(x-1)(4x^2-9)
=(x-1)(2x-3)(2x+3)
\(x^3+8x^2+17x+10\)
\(=x^3+2x^2+x^2+5x^2+10x+5x+2x+10\)
\(=\left(x^3+x^2\right)+\left(2x^2+2x\right)+\left(5x^2+5x\right)+\left(10x+10\right)\)
\(=x^2\left(x+1\right)+2x\left(x+1\right)+5x\left(x+1\right)+10\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2+2x+5x+10\right)\)
\(=\left(x+1\right)\left[x\left(x+2\right)+5\left(x+2\right)\right]\)
\(=\left(x+1\right)\left(x+2\right)\left(x+5\right)\)
6x3 - 11x2 - x - 2
= 6x3 - 12x2 + x2 - 2x + x - 2
= ( 6x3 - 12x2 ) + ( x2 - 2x ) + ( x - 2 )
= 6x2( x - 2 ) + x( x - 2 ) + 1( x - 2 )
= ( x - 2 )( 6x2 + x + 1 )
6x3-11x2+x+4
=6x2-12x2+6x+x2-5x+4
=6x.(x2-2x+1)+x2-4x-x+4
=6x.(x-1)2+x.(x-4)-(x-4)
=6x.(x-1)2+(x-4)(x-1)
=(x-1)[6x.(x-1)+x-4]
=(x-1)(6x2-6x+x-4)
=(x-1)(6x2+3x-8x-4)
=(x-1)[3x.(2x+1)-4.(2x+1)]
=(x-1)(2x+1)(3x-4)