Phân tích đa thức thành nhân tử
a. 5x3-45x
b. 7x3-+7
c. 5x2y-30xy2+45y3
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\(5x^2y+5xy^2-a^2x-a^2y\)
\(=5xy\left(x+y\right)-a^2\left(x+y\right)\)
\(=\left(x+y\right)\left(5xy-a^2\right)\)
a) 7x – 14 = 7(x - 2)
b) 5x3 - 10x2y +5xy2 = 5x(x2 - 2xy - y2) = 5x(x - y)2
c) 25 – x2= (x - 5)(x + 5)
a, \(7\left(x-2\right)\)
c, \(\left(5-x\right)\left(5+x\right)\)
a/ \(=5x\left(x^2-2x+3\right)\)
b/ \(=\left(x^2-2x\right)-\left(x-2\right)=x\left(x-2\right)-\left(x-2\right)=\left(x-1\right)\left(x-2\right)\)
a) \(5x^3-10x^2+15x=5x\left(x^2-2x+3\right)\)
b) \(x^2-3x+2=x\left(x-1\right)-2\left(x-1\right)=\left(x-1\right)\left(x-2\right)\)
a) \(5x^2y-20xy+20y=5y\left(x^2-4x+4\right)=5y\left(x-2\right)^2\)
b) \(3x^3+6x^2+3x=3x\left(x^2+2x+1\right)=3x\left(x+1\right)^2\)
c) \(3x^2y-12y=3y\left(x^2-4\right)=3y\left(x-2\right)\left(x+2\right)\)
d) \(7x^3-28x^2+28x=7x\left(x^2-4x+4\right)=7x\left(x-2\right)^2\)
a: \(5x^2y-20xy+20y\)
\(=4y\left(x^2-4x+4\right)\)
\(=4x\left(x-2\right)^2\)
b: \(3x^3+6x^2+3x\)
\(=3x\left(x^2+2x+1\right)\)
\(=3x\left(x+1\right)^2\)
c: \(3x^2y-12y\)
\(=3y\left(x^2-4\right)\)
\(=3y\left(x-2\right)\left(x+2\right)\)
d: \(7x^3-28x^2+28x\)
\(=7x\left(x^2-4x+4\right)\)
\(=7x\left(x-2\right)^2\)
a,x3-27+3x(x-3)
=(x-3)(x2+3x+9)+3x(x-3)
=(x-3)(x2+6x+9)
=(x-3)(x+3)2
b,5x3-7x2+10x-14
= x2(5x-7)+2(5x-7)
= (5x-7)(x2+2)
a,x3-27+3x(x-3)
=(x-3)(x2+3x+9)+3x(x-3)
=(x-3)(x2+3x+9+3x)
=(x-3)(x2+6x+9)
=(x-3)(x+3)2
b,5x3-7x2+10x-14
=(5x3+10x)-(7x2+14)
=5x(x2+2)-7(x2+2)
=(x2+2)(5x-7)
a, 2xy^2 ( x^3 -3xy - 4 )
b, x^2 - 4x - 4x +16
= x(x-4) - 4(x-4)
= (x-4) (x-4)
\(a,=\left(x-y\right)\left(x+y\right)-\left(x+y\right)=\left(x+y\right)\left(x-y-1\right)\\ b,=\left(x+y\right)\left(x-5\right)\\ c,=5x^2\left(x-y\right)-10x\left(x-y\right)=5x\left(x-2y\right)\left(x-y\right)\\ d,=x^2-2xy=x\left(x-2y\right)\\ e,=\left(3x-2y\right)\left(9x^2+6xy+4y^2\right)\)
a/ 5x3-45x=5x(x2-9)=5x(x+3)(x-3)
b/7x3-7=7(x3-1)=7(x-1)(x2+x+1)
c/5x2y-30xy2+45y3=5y(x2-6xy+9y2)=5y(x-3y)2
\(a,5x^3-45x=5x\left(x^2-9\right)=5x\left(x-3\right)\left(x+3\right)\)
\(b,7x^3-7=7\left(x^2-1\right)=7\left(x-1\right)\left(x+1\right)\)
\(c,5x^2y-30xy^2+45y^3=5y\left(x^2-6xy+9y^2\right)=5y\left(x-3y\right)^2\)
kết bạn với tớ nhé >_^