tìm x , biết : 4x (x-5)-(x-1 )(4x-3)=5

2 câu trả lời

a)4x(x -5) - ( x -1) (4x -3) = 5

x= 4x^2 - 20x - 4x^2 + 7x -3 = 5

x=-13x

x = 8-8/13

4x(x - 5) - (x - 1)(4x - 3)= 5

<=> 4x ² - 20x - (4x ² - 3x - 4x + 3) = 5

<=> 4x ² - 20x - 4x ² +3x + 4x - 3 = 5

<=> -20x + 7x = 5+3

<=> - 13x = 8

<=> x = 8/-13