Question

|3-x|=4

Answer 1

-1

Answer 2

\(\left|3-x\right|=4\)

\(\Rightarrow3-x=4hoặc-4\)

+) \(3-x=4\Rightarrow x=-1\)

+) \(3-x=-4\Rightarrow x=7\)

Vậy \(x\in\left\{-1;7\right\}\)

~ ^ _ ^ ~

Answer 3

|3-x|=4

T.H 1: 3-x = 4

=> x = 3 - 4

=> x = -1

T.H 2: 3-x = -4

=> x = 3 - (-4)

=> x = 3 + 4 (có thể bỏ qua bước này)

=> x = 7

Vậy x \(\in\) {-1; 7}