Question

3./x/+9=24 tim x

Answer 1

Answer 2

3.|x| + 9 = 24

=> 3.|x| = 24 -9 

=> 3.|x| = 15 

=>|x| = 15 : 3 

=> |x| = 5

=> x\(\in\) { -5 ; 5}

Answer 3

\(3\left|x\right|+9=24\\ \Rightarrow3\left|x\right|=24-9\\ \Rightarrow3\left|x\right|=15\\ \Rightarrow\left|x\right|=\dfrac{15}{3}\\ \Rightarrow\left|x\right|=5\\ \Rightarrow x=\pm5\)

Vậy \(x\in\left\{5;-5\right\}\)