Question

3x²-5x-8

phân tích đa thức thành nhân tử

 

Answer 1

\(3x^2-5x-8\)

\(=3x^2+3x-8x-8\)

\(=\left(3x^2+3x\right)-\left(8x+8\right)\)

\(=3x\left(x+1\right)-8\left(x+1\right)\)

\(=\left(3x-8\right)\left(x+1\right)\)

Answer 2

3x² - 5x - 8 = 3x² + 3x - 8x - 8 = ( 3x² + 3x ) - ( 8x + 8 )

= 3x( x + 1 ) - 8( x + 1 ) = ( 3x - 8 )( x + 1 )

Answer 3

3x²-5x-8

=3x²+3x-8x-8

=3x(x+1)-8(x+1)

=(x+1)((3x-8)