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a) \(45+x^3-5x^2-9x\)
\(\Leftrightarrow\left(45-9x\right)+\left(x^3-5x^2\right)\)
\(\Leftrightarrow-9\left(x-5\right)+x^2\left(x-5\right)\)
\(\Leftrightarrow\left(x-5\right)\left(x-3\right)\left(x+3\right)\)
TK NKA !!!
a) \(9x^2-12x+4\)
\(=9x^2-6x-6x+4\)
\(=3x\left(3x-2\right)-2\left(3x-2\right)\)
\(=\left(3x-2\right)^2\)
b) \(2xy+16-x^2-y^2\)
\(=-\left(x^2-2xy+y^2-16\right)\)
\(=-\left(x-y\right)^2+16\)
\(=\left(4-x+y\right)\left(4+x-y\right)\)
c) \(3x+2x^2-2\)
\(=2x^2+4x-x-2\)
\(=2x\left(x+2\right)-\left(x+2\right)=\left(x+2\right)\left(2x-1\right)\)
a, 4x2 - 12x + 9
= (2x + 3)2
b, 9x4y3 + 3x2y4
= 3x2y3(3x2 + y)
c, ( x - 3 )2 - 2x ( x - 3 )
= (x - 3)(x - 3 - 2x)
= (x - 3)(-x - 3)
d, 3x ( x - 1 ) + 6 ( x - 1 )
= 3(x - 1)(x + 2)
e, 2x ( x + 1 ) - 4x - 4
= 2x(x + 1) - 4(x + 1)
= (x + 1)(2x - 4)
= 2(x + 1)(x - 2)
f, ( 2x - 3 )2 - 4x + 6
= (2x - 3)2 - 2(2x - 3)
= (2x - 3)(2x - 3 - 2)
= (2x - 3)(2x - 5)
1) Ta có: 2xy - x2 - y2 + 16
= -(x2 - 2xy + y2 - 16)
= -[(x - y)2 - 16]
= -(x - y - 4)(x - y + 4)
2) x3 + 2x2y + xy2 - 9x
= x(x2 + 2xy + y2 - 9)
= x[(x + y)2 - 9]
= x(x + y - 3)(x + y + 3)
3) x4 - 2x2 = x2(x2 - 2)
1. 2xy-x2-y2+16= -(x2-2xy+y2-16) = -(x2-2xy+y2)-16 = -(x-y)2-16= (x+y)2-42= (x+y-4).(x+y+4)
2. x3+2x2y+xy2-9x= (có sai đề không vậy?)
1) \(x^4+2x^3-9x^2-10x-24\)
\(=x^4+4x^3+x^2-2x^3-8x^2-2x-2x^2-8x-2\)
\(=x^2.\left(x^2+4x+1\right)-2x.\left(x^2+4x+1\right)-2.\left(x^2+4x+1\right)\)
\(=\left(x^2+4x+1\right)\left(x^2-2x-2\right)\)
2) \(6x^4+7x^3+5x^2-x-2\)
\(=6x^4-3x^3+10x^3-5x^2+10x^2-5x+4x-2\)
\(=3x^3\left(2x-1\right)+5x^2\left(2x-1\right)+5x\left(2x-1\right)+2\left(2x-1\right)\)
\(=\left(2x-1\right)\left(3x^3+5x^2+5x+2\right)\)
\(=\left(2x-1\right)\left(3x^2+2x^2+3x^2+2x+3x+2\right)\)
\(=\left(2x-1\right)\left(3x+2\right)\left(x^2+x+1\right)\)
3) \(2x^4+3x^3+2x^2-1\)
\(=2x^4+2x^3+x^3+x^2+x^2+x-x-1\)
\(=\left(x+1\right)\left(2x^3+x^2+x-1\right)\)
\(=\left(x+1\right)\left(2x-1\right)\left(x^2+x+1\right)\)
4) \(x^3-x^2-x-2\)
\(=x^3-2x^2+x^2-2x+x-2\)
\(=\left(x-2\right)\left(x^2+x+1\right)\)