Question

1)     |2x-6| + |3-x|=15
2)      $\frac{y}{12} apartine (1, \sqrt{2} )$

Answer 1

1)2x-x-6+3=15
x-3=15
x=15+3
x=18
18*2-6+3-18=36-3-18=33-18=15

Answer 2

|2x-6| + |3-x|=15,  aici sin 2 cazuri...unul cand expresia de sub modul e pozitiva si altul cand expresia e negativa.
 1 caz 2x-6+3-x15 ⇔ 2x-x=15+6-3⇔x=18
2 caz -(2x-6)-(3-x)=15⇔-2x+6-3+x=15⇔-2x+x=15-6+3⇔-x=12⇔x=-12
S={-12;18}