Question

Tìm x biết:

x( 5-2x )+2x ( x-1 ) =15

Answer 1

<=> \(5x-2x^2+2x^2-2x=15\)

<=> \(3x=15=>x=\dfrac{15}{3}=5\)

Answer 2

x( 5-2x )+2x ( x-1 ) =15

<=> 5x - 2x² + 2x² - 2x = 15

<=> 3x = 15

<=> x = 5

Answer 3

x.5 - x.2x+ 2x.x-2x=15

5x- 2x² + 2x²- 2x=15

5x - 2x = 15

3x=15

x = 5

Answer 4

<=> 

<=>