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a) 4x2 - 17xy + 13y2
=4x2-4xy-13xy+13y2
=4x(x-y)-13y(x-y)
=(x-y)(4x-13y)
b) x8 + x4 +1
=x8+2x4+1-x4
=(x4+1)2-x4
=(x4+1-x2)(x4+1+x2)
mình chỉ làm được câu b) thôi ^^
a^2-2ab+b^2-4x^2
= (a-b)^2-(2x)^2
= (a-b+2x)(a-b-2x)
a/ x2+2x-y2+1=x2+2x+1-y2
= x2+x+x+1-y2
= x(x+1)+(x+1)-y2
= (x+1)2-y2
= (x+1-y)(x+1+y)
b/ a2-2ab+b2-4x2=a2-ab-ab+b2-(2x)2
=a(a-b)-b(a-b)-(2x)2
=(a-b)2-(2x)2
= (a-b-2x)(a-b+2x)
\(x^2-y^2+4x+4\)
\(=\left(x+2\right)^2-y^2\)
\(=\left(x+2+y\right)\left(x+2-y\right)\)
\(4x^2-y^2+8\left(y-2\right)\)
\(=4x^2-\left(y^2-8y+16\right)\)
\(=4x^2-\left(y-4\right)^2\)
\(=\left(2x+y-4\right)\left(2x-y+4\right)\)
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
^^
\(b,2x^2+4x+2-2y^2\)
\(=2\left(x^2+2x+1-y^2\right)\)
\(=2\left[\left(x+1\right)^2-y^2\right]\)
\(=2\left(x+1+y\right)\left(x+1-y\right)\)
a. x4 - 27x = x ( x3 - 33 ) = = x ( x - 3 ) ( x2 + 3x + 32 ) = x ( x - 3 ) ( x2 + 3x + 9 )
b. x3 + 2x2 + 2x + 1 = ( x3 + 13 ) + ( 2x2 + 2x ) = ( x + 1 ) ( x2 - x + 1 ) + 2x ( x + 1 ) = ( x + 1 ) ( x2 + x + 1 )
c. 4x - 4y + x2 - 2xy + y2 = 4 ( x - y ) + ( x - y )2 = ( x - y ) ( x - y + 4 )
a
\(x^4-27x\)
\(=x\left(x^3-27\right)\)
\(=x\left(x^3-3^3\right)\)
\(=x\left(x-3\right)\left(x^2+3x+9\right)\)
b
\(x^3+2x^2+2x+1\)
\(=x^3+x^2+x^2+x+x+1\)
\(=x^2\left(x+1\right)+x\left(x+1\right)+1\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2+x+1\right)\)
c
\(4x-4y+x^2-2xy+y^2\)
\(=4\left(x-y\right)+\left(x-y\right)^2\)
\(=\left(x-y\right)\left(x-y+4\right)\)
a) \(3x^2y+6xy^2=3xy\left(x+2y\right)\)
b) \(x^2-y^2+4x+4\)
\(=\left(x^2-y^2\right)+4\left(x+1\right)\)
\(=\left(x-y\right)\left(x+y\right)+4\left(x+1\right)\)
c) \(x^2-2x-24\)
\(=x^2+6x-4x-24\)
\(=x\left(x+6\right)-4\left(x+6\right)\)
\(=\left(x+6\right)\left(x-4\right)\)
Chúc bạn học tốt nhé!
a) 3x2y+6xy2=3xy(x+2y)
b)x2-y2+4x+4=(x2+4x+4)-y2=(x+2)2-y2=(x-y+2)(x+y+2)
c) x2-2x-24=x2-6x+4x-24=x(x-6)+4(x-6)=(x+4)(x-6)
hc tốt
a, ( 2x - 1)^2 - (4x + 2) ^2 = ( 2x - 1 - 4x- 2) ( 2x - 1 + 4x + 2) = (-2x-3)(6x+1) = - (2x+3)(6x+1)
b, 8x^3 + 12x^2y + 6xy^2 + y^3
= (2x)^2 + 3.(2x)^2 . y + 3.2x.y^2 + y^3
= (2x + y)^3
a) x2 + 6x + 9 = x2 + 2 . x . 3 + 32 = (x + 3)2
b) 10x – 25 – x2 = -(-10x + 25 +x2) = -(25 – 10x + x2)
= -(52 – 2 . 5 . x – x2) = -(5 – x)2
c) 8x3 - 1/8 = (2x)3 – (1/2)3 = (2x - 1/2)[(2x)2 + 2x . 12 + (1/2)2]
= (2x - 1/2)(4x2 + x + 1/4)
d)1/25x2 – 64y2 = (1/5x)2(1/5x)2- (8y)2 = (1/5x + 8y)(1/5x - 8y)
\(16x^2+y^2+4y-16x-8xy\)
\(=\left(4x-y\right)^2-4\left(4x-y\right)\)
\(=\left(4x-y\right)\left(4x-y-4\right)\)
a) \(16x^2+y^2+4y-16x-8xy\)
\(=\left(4x\right)^2-8xy+y^2+4\left(y-4x\right)\)
\(=\left(4x-y\right)^2+4\left(y-4x\right)\)
\(=\left(y-4x\right)^2+4\left(y-4x\right)=\left(y-4x\right)\left(y-4x+4\right)\)
a,\(x^2-y^2+2x+1=\left(x^2-2x+1\right)-y^2=\left(x+1\right)^2-y^2=\left(x+1-y\right)\left(x+1+y\right)\)b
\(4x^2-17xy+13y^2=\left(4x^2-4xy\right)+\left(13y^2-13xy\right)=4x\left(x-y\right)-13y\left(x-y\right)\)\(=\left(4x-13y\right)\left(x-y\right)\)
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