Phân tích đa thức thành phân tử
60x+18x2- 6x3
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a) ( x 2 – 4x + 1)( x 2 – 2x + 3).
b) ( x 2 + 5x – 1)( x 2 + x – 1).
\(8x^3+60x^2y+150xy^2+125y^3\)
\(=\left(8x^3+125y^3\right)+\left(60x^2y+150xy^2\right)\)
\(=\left(2x+5y\right)\left(4x^2-10xy+25y^2\right)+30xy\left(2x+5y\right)\)
\(=\left(2x+5y\right)\left(4x^2-10xy+25y^2+30xy\right)\)
\(=\left(2x+5y\right)\left(4x^2+20xy+25y^2\right)\)
\(=\left(2x+5y\right)\left(2x+5y\right)^2=\left(2x+5y\right)^3\)
C2 : Áp dụng luôn HĐT ( x + y ) 3
\(8x^3+60x^2y+150xy^2+125y^3\)
\(=\left(2x\right)^3+3.\left(2x\right)^2.5y+3.2x.\left(5y\right)^2+\left(5y\right)^3\)
\(=\left(2x+5y\right)^2\)
=.= hok tốt!!
a. \(2x^{^2}\left(2x^{^3}-3x+1\right)\)
b. \(\left(4m-25n\right)\left(4m+25n\right)\)
b: \(4m^2-25n^2=\left(2m-5n\right)\left(2m+5n\right)\)
c: \(x^4+x^3-4x^2+x+1\)
\(=x^4-x^3+2x^3-2x^2-2x^2+2x-x+1\)
\(=\left(x-1\right)\left(x^3+2x^2-2x-1\right)\)
\(=\left(x-1\right)\left[\left(x-1\right)\left(x^2+x+1\right)+2x\left(x-1\right)\right]\)
\(=\left(x-1\right)^2\cdot\left(x^2+3x+1\right)\)
1, = 6(x^2 .y -z^2 +10x+25 )
2, = x^2 -2x-9x+18
= x(x-2)-9(x-2)
= (x-9)(x-2)
e: \(x^2+6x+9-y^2\)
\(=\left(x+3\right)^2-y^2\)
\(=\left(x+3-y\right)\left(x+3+y\right)\)
f: \(x^2-2x+7x-14\)
\(=x\left(x-2\right)+7\left(x-2\right)\)
=(x-2)(x+7)
h: \(5x^2-10xy+5y^2-20\)
\(=5\left(x^2-2xy+y^2-4\right)\)
\(=5\left(x-y-2\right)\left(x-y+2\right)\)
a: \(3x^4-6x^3+2x^2=x^2\left(3x^2-6x+2\right)\)
b: \(x^3y+12x^2y+36xy=xy\left(x^2+12x+36\right)=xy\left(x+6\right)^2\)
c: \(x^3y-9xy^3=xy\left(x^2-9y^2\right)=xy\left(x-3y\right)\left(x+3y\right)\)
d: \(x^2y^2-2xy^2+y^2=y^2\left(x-1\right)^2\)
\(60x+18x^2-6x^3\)
\(=-6x^3+18x^2+60x\)
\(=-6x\left(x+5\right)\left(x-2\right)\)