1) ( 4x + 1 )² + ( 4x - 1 )² - 2( 4x + 1 ).( 4x - 1 )

= ( 4x + 1 - 4x - 1 )²

= 2²

= 4

2) 4x² - 9 + ( 2x + 3 )

= ( 2x )² - 3² + ( 2x + 3 )

= ( 2x + 3 ).( 2x - 3 ) + ( 2x + 3 )

= ( 2x + 3 ). ( 2x - 3 + 1 )

= ( 2x + 3 ) .( 2x - 2 )

= 2.( 2x + 3 ) .( x - 1 )

1, (4x+1)^2 + (4x-1)^2 - 2(4x+1)(4x-1)

=[(4x+1)-(4x-1)]^2

=(4x+1-4x+1)^2

=2^2

=4

2, 4x^2 - 9 +(2x+3)

=(4x^2 - 9)+(2x+3)

=(2x+3)(2x-3)+(2x+3)

=(2x+3)(2x-3+1)

=(2x+3)(2x-2)

=2(x-1)(2x+3)

=.= hok tốt!!

\(x^3+4x^2+4x+1\)

\(=x^3+3x^2+x+x^2+3x+1\)

\(=x\left(x^2+3x+1\right)+\left(x^2+3x+1\right)\)

\(=\left(x+1\right)\left(x^2+3x+1\right)\)

4x²-y²+4x+1

=(4x²+4x+1)-y²

=(2x+1)²-y²

=(2x+1-y)(2x+1+y)

bài này tớ cũng ko chắc:

\(4x^2-y^2+4x+1=\left(4x+4x^2+1\right)-y^2= \left(2x+1\right)^2-y^2\)

\(=\left(2x+1\right)\left(2x+1\right)-y^2=\left(2x+1-y\right)\left(2x+1+y\right)\)

\(x^4+4x^3+2x^2-4x+1\)

\(=x^4+2x^3-x^2+2x^3+4x^2-2x-x^2-2x+1\)

\(=x^2\left(x^2+2x-1\right)+2x\left(x^2+2x-1\right)-\left(x^2+2x-1\right)\)

\(=\left(x^2+2x-1\right)^2\)

 = ( x - y)^2 - z^2 

= ( x - y -z)(x - y + z) 

= (4x² + 4x+ 1) - y²

=(4x² + 4x +1) -y²

=[(2x)²  + 2.2x.1 +1] - y²

=(2x +1)² - y²

=[(2x +1) -y].[(2x +1) +y]

=(2x +1 -y).(2x +1 +y)

4x^2-y^2+4x+1

=(2x+1)^2-y^2

=(2x+1-y)(2x+1+y)

\(4x^4-8x^3+4x^3-8x^2+x^2-2x-2x+4\\ =4x^3\left(x-2\right)+4x^2\left(x-2\right)+x\left(x-2\right)-2\left(x-2\right)\\ =\left(x-2\right)\left(4x^3+4x^2+x-2\right)\\ =\left(x-2\right)\left(4x^3-2x^2+6x^2-3x+4x-2\right)\\ =\left(x-2\right)\left[2x^2\left(2x-1\right)+3x\left(2x-1\right)+2\left(2x-1\right)\right]\\ =\left(x-2\right)\left(2x-1\right)\left(2x^2+3x-2\right)\)

e) \(=x^2\left(x+1\right)-2x\left(x+1\right)+3\left(x+1\right)=\left(x+1\right)\left(x^2-2x+3\right)\)

g) \(=x^2\left(3x-1\right)-x\left(3x-1\right)+4\left(3x-1\right)=\left(3x-1\right)\left(x^2-x+4\right)\)

h) \(=3x^2\left(2x+1\right)-x\left(2x+1\right)+\left(2x+1\right)=\left(2x+1\right)\left(3x^2-x+1\right)\)

i) \(=2x^2\left(2x+1\right)+2x\left(2x+1\right)+\left(2x+1\right)=\left(2x+1\right)\left(2x^2+2x+1\right)\) 

\(x^3+4x^2+4x-16y^2\)

\(=\left(x^3+2x^2\right)+\left(2x^2+4x\right)-16y^2\)

\(=x^2.\left(x+2\right)+2x.\left(x+2\right)-16y^2\)

\(=\left(x+2\right).\left(x^2+2x\right)-16y^2\)

\(=x.\left(x+2\right).\left(x+2\right)-\left(4y\right)^2\)

\(=x.\left(x+2\right)^2-\left(4y\right)^2\)

\(=\left[\sqrt{x}.\left(x+2\right)\right]^2-4y^2\)

\(=\left[\sqrt{x}.\left(x+2\right)-4y\right].\left[\sqrt{x}.\left(x+2\right)+4y\right]\)

Tham khảo nhé~

nếu đưa vô căn phải có điều kiện là x > 0

\(x^3+4x^2+4x-16y^2=x\left(x+2\right)^2-\left(4y\right)^2\)

\(=\left(x\sqrt{x}+2\sqrt{x}\right)^2-\left(4y\right)^2=\left(x\sqrt{x}+2\sqrt{x}-4y\right)\left(x\sqrt{x}+2\sqrt{x}+4y\right)\)