Question

bài 1; phân tích đa thức sau thành nhân tử

c, x mũ 2 + 3x - 4

c, x mũ 2 + 3x - 18

c, 2x mũ 2 + 3x - 5

c, 3x mũ 2 - 8x + 4

c, 8x mũ 2 + 2x - 3

Answer 1

haha quá dễ

Answer 2

c, x mũ 2 + 3x - 4 = x^2 + 3 x X -4

c, x mũ 2 + 3x - 18= x^2 + 3xX -18

c, 2x mũ 2 + 3x - 5=  2xX^2 + 3xX -5

c, 3x mũ 2 - 8x + 4= 3 x X^2 - 8 x X + 4

c, 8x mũ 2 + 2x - 3= 8 x X^2 + 2 x X -3

Answer 3

a) = x² - 4x + x - 4 = x( x - 4 ) + ( x - 4 ) = ( x - 4 )( x + 1 )

b) = x² - 3x + 6x - 18 = x( x - 3 ) + 6( x - 3 ) = ( x + 6 )( x - 3 )

c) = 2x² - 2x + 5x - 5 = 2x( x - 1 ) + 5( x - 1 ) = ( x - 1 )( 2x + 5 )

d) = 3x² - 6x - 2x + 4 = 3x( x - 2 ) - 2( x - 2 ) = ( x - 2 )( 3x - 2 )

e) = 8x² - 4x + 6x - 3 = 4x( 2x - 1 ) + 3( 2x - 1 ) = ( 2x - 1 )( 4x + 3 )

Answer 4

Trả lời:

a, x² + 3x - 4 = x² - x + 4x - 4 = x ( x - 1 ) + 4 ( x - 1 ) = ( x - 1 )( x + 4 )

b, x² + 3x - 18 = x² - 3x + 6x - 18 = x ( x - 3 ) + 6 ( x - 3 ) = ( x - 3 )( x + 6 )

c, 2x² + 3x - 5 = 2x² + 5x - 2x - 5 = x ( 2x + 5 ) - ( 2x + 5 ) = ( 2x + 5 )( x - 1 )

d, 3x² - 8x + 4 = 3x² - 6x - 2x + 4 = 3x ( x - 2 ) - 2 ( x - 2 ) = ( x - 2 )( 3x - 2 )

e, 8x² + 2x - 3 = 8x² - 6x + 4x - 3 = 2x ( 4x - 3 ) + ( 4x - 3 ) = ( 4x - 3 )( 2x + 1 )