Question

Ex.16 Va rog ajutor!!!!!!!!!

Answer 1

a) |x|+1=5

|x|=4; x∈{-4,4}

b)3|x|+7=22

3|x|=22-7 =>|x|=15:3=5; x∈{-5, 5}

c)2|x|-1=|x|+6

2|x|-|x|=6+1

|x|=7; x∈{-7,7}

d)5|x|-2=3|x|+4

5|x|-3|x|=4+2= >2|x|=6

|x|=3; x∈{-3,3}

e) |x-3|=0

x-3=0 =>x=3

f) |x-1|= -2

|x-1|≥0, nu poate fi negativ => x∈Ф