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\(b,=x^4-2x^3-x^3+2x^2+3x^2-6x-3x+6\\ =\left(x-2\right)\left(x^3-x^2+3x-3\right)\\ =\left(x-2\right)\left(x-1\right)\left(x^2+3\right)\\ c,=x^4-2x^3+4x^3-8x^2+4x^2-8x+3x-6\\ =\left(x-2\right)\left(x^3+4x^2+4x+3\right)\\ =\left(x-2\right)\left(x^3+3x^2+x^2+3x+x+3\right)\\ =\left(x-2\right)\left(x+3\right)\left(x^2+x+1\right)\)
b) 3x4-3x3+9x3-9x2-24x2+24x-48x+48
=3x3(x-1)+9x2(x-1)-24x(x-1)-48(x-1)
=(x-1)(3x3+9x2-24x-48)
=3(x-1)(x3+3x2-8x-16)
b. 2x3-3x2+3x-1=2x3-x2-2x2+x+2x-1
= x2(2x-1)-x(2x-1)+(2x-1)
=(2x-1)(x2-x-1)
c. 3x3-14x2+4x+3= 3x3+x2-15x2-5x+9x+3
=x2(3x+1)-5x(3x-1)+3(3x+1)
=(3x+1)(x2-5x+3)
a) \(-4x^2+10xy-14x\)
\(=2x\left(-2x+5y-7x\right)\)
b) \(3x\left(x-1\right)-y\left(1-x\right)+2x-2\)
\(=3x\left(x-1\right)+y\left(x-1\right)+2\left(x-1\right)\)
\(=\left(3x+y+2\right)\left(x-1\right)\)
Bài làm
a) -4x2 + 10xy - 14x
= 2x( -2x + 5y - 7 )
b) 3x( x - 1 ) - y ( 1 - x ) + 2x - 2
= 3x( x - 1 ) + y( x - 1 ) + 2( x - 1 )
= ( x - 1 )( 3x + y + 2 )
# Học tốt #
x3 + x2 + 4
= x3 + 2x2 - x2 - 2x + 2x + 4
= x2(x + 2) - x(x + 2) + 2(x + 2)
= (x + 2)(x2 - x + 2)
2x3 - 3x2 + 3x - 1
= 2x3 - x2 - 2x2 + x + 2x - 1
= 2x2(x - 1/2) - 2x(x - 1/2) + 2(x - 1/2)
= (x - 1/2)(2x2 - 2x + 2)
= 2(x - 1/2)(x2 - x + 1)
3x3 - 14x2 + 4x + 3
= 3x3 + x2 - 15x2 - 5x + 9x + 3
= 3x2(x + 1/3) - 15x(x + 1/3) + 9(x + 1/3)
= (x + 1/3)(3x2 - 15x + 9)
= 3(x + 1/3)(x2 - 5x + 3)
a: \(x^4+x^2+2x+6\)
\(=x^4-2x^3+3x^2+2x^3-4x^2+6x+2x^2-4x+6\)
\(=\left(x^2-2x+3\right)\left(x^2+2x+2\right)\)
phân tích đa thức thành nhân tử
a) 4x^2+8xy-3x-6y
b)x^4y-3x^3y^2+3x^2y^3+xy^4
c)x^3-5x^2-14x
d)x^4+4y^4
\(4x^2+8xy-3x-6y=4x\left(x+2y\right)-3\left(x+2y\right)=\left(4x-3\right)\left(x+2y\right)\)
\(x^4y-3x^3y^2+3x^2y^3-xy^4=xy\left(x^3-3x^2y+3xy^2-y^3\right)=xy\left(x-y\right)^3\)
\(x^3-5x^2-14x=x\left(x^2-5x-14\right)=x\left(x^2-7x+2x-14\right)=x\left[x\left(x-7\right)+2\left(x-7\right)\right]=x\left(x-7\right)\left(x+2\right)\)
\(x^4+4y^4=\left(x^2\right)^2+2\times x^2\times2y^2+\left(2y^2\right)^2-4x^2y^2=\left(x^2+2y^2\right)^2-\left(2xy\right)^2=\left(x^2-2xy+2y^2\right)\left(x^2+2xy+2y^2\right)\)