Question

Resolva a equação modular |x|²+2|x|-15=0

Answer 1

Δ = 2² -4·1·(-15)
Δ = 4+60
Δ = 64

x = - 2 +- √64 /2                           
x = -2 +- 8/2                   x = 2+8/2= 10/2= 5

x= 2-8/2=6/2=3