Question

||2x + 1|-2|=5.Cum s-ar putea rezolva?

Answer 1

||2x+1|-2| = 5

|2x+1|-2 = ± 5 =>

= |2x+1|-2 = 5 sau |2x+1|-2 = -5

=> |2x+1| = 7 sau |2x+1| = -3 (F)

=> 2x+1 = ±7 sau x ∈ Ø

=> 2x+1 = -7 sau 2x+1 = 7

=> 2x = -8 sau 2x = 6

=> x = -4 sau x = 3

=> x ∈ {-4; 3}