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\(b,2x^2+4x+2-2y^2\)
\(=2\left(x^2+2x+1-y^2\right)\)
\(=2\left[\left(x+1\right)^2-y^2\right]\)
\(=2\left(x+1+y\right)\left(x+1-y\right)\)
1-2y+y2=(1-y)2
(x+1)2-25=(x+1-5)(x+1+5)=(x-4)(x+6)
1-4x2=(1-2x)(1+2x)
8-27x3=(2-3x)(4+6x+9x2)
Phân tích đa thức thành nhân tử:
b, 20x4-5
= 5(4x4-1)
=5(2x2-1)(2x2+1)
học tốt
2x2+4x+2-2y2
= 2(x2 + 2x +1 - y2)
= 2 ( (x+1)2 -y2)
=2(x+1+y)(x+1-y)
\(x^2-y^2-4x-2y+3\)
\(=\left(x^2-4x+4\right)-\left(y^2+2y+1\right)\)
\(=\left(x-2\right)^2-\left(y+1\right)^2\)
\(=\left(x-2-y-1\right)\left(x-2+y+1\right)\)
\(=\left(x-y-3\right)\left(x+y-1\right)\)
a) 5x2 - 10x = 5x( x - 2 )
b) x2 - y2 - 2x + 2y = (x2 - y2) - (2x - 2y)
= (x - y ) ( x + y)-2 (x-y)
= ( x - y) ( x + y - 2)
c) 4x2 - 4xy - 8y2 = (4x2 - 4xy + 8y2) - 9y2
= (2x - 9y2) - 3y2
= (2x - y - 3y) (2x - y + 3y)
= (2x - 4y) (2x + 2y)
= 4(x - 2y) (x + y)
a) 5x2 - 10x = 5x( x - 2 )
b) x2 - y2 - 2x + 2y = (x2 - y2) - (2x - 2y)
= (x - y ) ( x + y)-2 (x-y)
= ( x - y) ( x + y - 2)
c) 4x2 - 4xy - 8y2 = (4x2 - 4xy + 8y2) - 9y2
= (2x - 9y2) - 3y2
= (2x - y - 3y) (2x - y + 3y)
= (2x - 4y) (2x + 2y)
= 4(x - 2y) (x + y)
1, x2(x2+2x+1)=x2(x+1)2
2, 2(x2+2x+1-y2)=2(x+1-y)(x+1+y)
3, 16-(x2+2xy+y2)=(4-x-y)(4+x+y)
\(x^4+2x^3+x^2\)
\(=x^2\left(x^2+2x+1\right)\)
\(=x^2\left(x+1\right)^2\)
hk tốt
^^
\(\left(y^2-2y+1\right)-\left(2x\right)^2\)
\(\left(y-1\right)^2-\left(2x\right)^2\)
\(\left(y-1-2x\right)\left(y-1+2x\right)\)
Nhớ chọn nhé,mình sẽ ủng hộ cho
=(y2 - 2y -1)- )-(2y2)
=(y-1)2 – (2y)2
=(y-1-2y)x(y-1+2y)
=(-y-1)x(3y-1)