Question

Phân tích thành nhân tử

b) (1+2x)(1-2x)-x(x+2)(x-2)

Answer 1

= (1-4x²)-x(x²-4)

=1-4x²-x³+4x

Answer 2

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

= ( 1 - 4 x² ) - x ( x² - 4 )

= 1 - 4 x² - x³ + 4x

Answer 3

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

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

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

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

\(=\left(1-x\right)\left(x^2+5x+1\right)\)