Question

2|2x+1|-1=13
......va rogggg urgent dau de toate​

Answer 1

Răspuns:

Explicație pas cu pas:

2I2x + 1I - 1 = 13

2I2x + 1I = 13 + 1 = 14

I2x + 1I = 14 : 2 = 7

2x + 1 = 7 ⇒ 2x = 6 ⇒ x = 3

2x + 1 = -7 ⇒ 2x = -8 ⇒ x = -4

Answer 2

$\it 2|2x+1|-1=13|_{+1} \Rightarrow 2|2x+1|=14|_{:2} \Rightarrow |2x+1|=7 \Rightarrow \\ \\ \Rightarrow 2x+1=\pm7 \Rightarrow 2x+1\in\{-7,\ 7\}|_{-1} \Rightarrow 2x\in\{-8,\ 6\}|_{:2} \Rightarrow x\in\{-4,\ 3\}$