Question

  rút gọn biểu thức sau : ( 2x - 1 )( 2x + 1 ) + 4x( 1 - x )

 

Answer 1

\(\left(2x-1\right)\left(2x+1\right)+4x\left(1-x\right)\)

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

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

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

\(=\left(4x-1\right)+0\)

\(=4x-1\)

Answer 2

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

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

=4x-1

Answer 3

\(\left(2x-1\right)\left(2x+1\right)+4x\left(1-x\right)\)

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

\(=4x-1\)

Answer 4

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

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

=4x-1