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\(x^4-4x^3+8x^2-16x+16 \)
\(=x^3\left(x-2\right)-2x^2\left(x-2\right)+4x\left(x-2\right)-8\left(x-2\right)\)
\(=\left(x-2\right)\left(x^3-2x^2+4x-8\right)\)
\(=\left(x-2\right)\left[x^2\left(x-2\right)+4\left(x-2\right)\right]\)
\(=\left(x-2\right)^2\left(x^2+4\right)\)
\(A=x^4-x^2+16\)
\(=x^4+8x^2+16-9x^2\)
\(=\left(x^2+4\right)^2-\left(3x\right)^2\)
\(=\left(x^2-3x+4\right)\left(x^2+3x+4\right)\)
\(B=x^4+6x^2+25\)
\(=x^4+10x^2+25-4x^2\)
\(=\left(x^2+5\right)-\left(2x\right)^2\)
\(=\left(x^2-2x+5\right)\left(x^2+2x+5\right)\)
\(C=4x^4-16-4x^2-16x\)
\(=4x^2\left(x^2-1\right)-16\left(x+1\right)\)
\(=4x^2\left(x-1\right)\left(x+1\right)-16\left(x+1\right)\)
\(=\left(4x^2-4x\right)\left(x+1\right)-16\left(x+1\right)\)
\(=\left(x+1\right)\left(4x^2-4x-16\right)\)
\(D=b^2-7bc+12c^2\)
\(=b^2-3bc-4bc+12c^2\)
\(=b\left(b-3c\right)-4c\left(b-3c\right)\)
\(=\left(b-3c\right)\left(b-4c\right)\)
Chúc bạn học tốt.
a) 16x2 - ( x2 + 4 )2
= ( 4x )2 - ( x2 + 4 )2
= [ 4x - ( x2 + 4 ) ][ 4x + ( x2 + 4 ) ]
= ( -x2 + 4x - 4 )( x2 + 4x + 4 )
= [ -( x2 - 4x + 4 ) ]( x + 2 )2
= [ -( x - 2 )2 ]( x + 2 )2
b) ( x + y )3 + ( x - y )3
= [ ( x + y ) + ( x - y ) ][ ( x + y )2 - ( x + y )( x - y ) + ( x - y )2 ]
= ( x + y + x - y )[ x2 + 2xy + y2 - ( x2 - y2 ) + x2 - 2xy + y2 ]
= 2x( 2x2 + 2y2 - x2 + y2
= 2x( x2 + 3y2 )
\(x^3+9x^2+6x-16\)
\(=x^3+x^2-2x+8x^2+8x-16\)
\(=x\left(x^2+x-2\right)+8\left(x^2+x-2\right)\)
\(=\left(x^2+x-2\right)\left(x+8\right)\)
\(=\left(x^2-x+2x-2\right)\left(x+8\right)\)
\(=\left[x\left(x-1\right)+2\left(x-1\right)\right]\left(x+8\right)\)
\(=\left(x-1\right)\left(x+2\right)\left(x+8\right)\)
Ta có
(x2-3)2+16
=x4-6x2+9+16
=x4-6x2+25
=x4+10x2+25-16x2
=(x2+5)2-16x2
=(x2+5-4x)(x2+5+4x)
A, (x+2)² - x² +2x -1
= (x+2)² -(x² - 2x +1)
= (x+2)² - (x -2)²
= (x +2 + x -2).(x+2-x+2)
=2x.2 =4x
B, 16x² -y²
= (4x)² - y²
= (4x - y).(4x + y)
Tk mình với bạn ơi. Đúng rồi nhé!!
CHÚC BẠN HỌC TỐT ✓✓
1, \(\left(x+2\right)^2-x^2+2x-1\)
\(=\left(x+2\right)^2-\left(x-1\right)^2\)
\(=\left(2x+1\right)\left(x+3\right)\)
\(2,16x^2-y^2=\left(4x+y\right)\left(4x-y\right)\)
\(x^3-9x^2+6x+16=\left(x^3+x^2\right)-\left(10x^2+10x\right)+\left(16x+16\right)\)
\(=x^2.\left(x+1\right)-10x\left(x+1\right)+16\left(x+1\right)\)
\(=\left(x+1\right).\left(x^2-10x+16\right)\)
\(=\left(x+1\right).\left[\left(x^2-8x\right)-\left(2x-16\right)\right]\)
\(=\left(x+1\right)\left[x\left(x-8\right)-2\left(x-8\right)\right]\)
\(=\left(x+1\right)\left(x-2\right)\left(x-8\right)\)
x3 - x2 + 16x - 16 = x2(x - 1) + 16(x - 1) = (x2 + 16)(x - 1)
x^3-x^2+16x-16 = (x^3-x^2)+(16x-16) = x^2.(x-1) + 16.(x-1) = (x-1)(x^2+16)