Question

rezolvati in R ecuatia |2x-8|=20

Answer 1

2x-8=20
2x=20+8
x=28/2
x=14

2x-8=-20
2x=-20+8
2x=-12
x=-12/2
x=-6
S={-6,14}

Answer 2

2x-8=20 sau 2x-8=-20;
2x-8=20⇒2x=28⇒x=14;
2x-8=-20⇒2x=-12⇒x=-6;
x∈R⇒x=(-6;14);