Question

rút gọn (x - 4).(x - 2) - (x - 1).(x - 3)

cần gấp ai giả hộ mình vs

Answer 1

\(\left(x-4\right)\left(x-2\right)-\left(x-1\right)\left(x-3\right)\)

\(=x^2-2x-4x+8-\left(x^2-3x-x+3\right)\)

\(=x^2-2x-4x+8-x^2+3x+x-3\)

\(=-2x+5\)

Answer 2

(x - 4).(x - 2) - (x - 1).(x - 3)

= x² - 2x - 4x + 8 - ( x² - 3x - x + 3 )

= x² - 2x - 4x + 8 - x² + 3x + x - 3

= 5 - 2x 

......

Answer 3

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

=x²-2x-4x+8-x²+3x+x-3

=-2x+5