Question

Calculati: a) |x|+3+|x|=17
b) 3(|x|+3|x|)=60​

Answer 1

a) |x|+3+|x|=17

2|x|=14

|x|=7

=>x∈{-7,7}

b) 3(|x|+3|x|)=60​

3|x|+9|x|=60

12|x|=60

|x|=5

=>x∈{-5,5}

Succes!

..ProfessorX..

Answer 2

Răspuns:

a.

lxl+3+lxl=17

2lxl=17-3

2lxl=14

lxl=7

x=±7

b) 3(lxl+3lxl)=60

3*4lxl=60

12lxl=60

lxl=60/12

lxl=5

xx=+/-5

Explicație pas cu pas: