Question

a)[3x+2 supra 5]= -3
b)| 4x+2|=|3x-5|
c)A={x apartine N /2x+3 mai mic sau egal de 5x-6},Determinati elementele multimii A.                     am nevoie de ajutor urgent! :(

Answer 1

a) 3x + 2 = -15
    3x = -17
     x = -17 / 3
b) 4x + 2 = 3x - 5 (cand 3x ≥ 5)
    4x + 2 = 5 - 3x (cand 5 *mai mare* 3x)
c)  5x - 2x *mai mare* 3 + 6 ⇒ 3x *mai mare* 9 ⇒ x *mai mare* 3
A={4, 5, 6, 7, 8, ..., n, ...}

Answer 2

a)17/3     b)4x+2=5-3x     c){4,5,6,7,8,9,10,11,12,13,14,15,16....n}