Question

Determinati x € R pentru care (3x+4) la a doua =(2x+1) la a doua

Answer 1

a²=b²⇒a=b sau a=-b

deci

3x+4=2x+1....x=-3....verificare(-5)²=(-5)²

3x+4=-2x-1....5x=-5....x=-1 verificare 1²=(-1)²

S={-3;-1}