Question

2х-1/х+5 при каком значение равно 4​

Answer 1

$\dfrac{2x-1}{x+5}=4\quad ODZ:\ x+5\neq0\ \Rightarrow\ x\neq-5$

$\displaystyle\frac{2x-1}{x+5}-4=0\\\\\\\frac{2x-1-4(x+5)}{x+5}=0\\\\\\\dfrac{2x-1-4x-20}{x+5}=0\\\\\\\dfrac{-2x-21}{x+5}=0\\\\\\\dfrac{-(2x+21)}{x+5}=0\quad|\cdot(-1)\\\\\\\dfrac{2x+21}{x+5}=0$

$2x+21=0\\2x=-21\\x=-21:2\\\\x=-10.5$

Answer 2

Ответ:

-10,5

Пошаговое объяснение:

2х-1/х+5 = 4

2x - 1 = 4*(x + 5)

2x - 1 = 4x + 20

4x - 2x = -1 - 20

2x = -21

x = -21 : 2

x = -10,5