the number of real solution of the equation

|x|^2 - 3|x| + 2 = 0 is

1. 4

2. 1

3. 3

4. 2

for x≥0

x²-3x+2=0 comparing with ax²+bx+c=0,

discriminant>0

=>it has 2 real solutions

now for x≤0

x²+3x+2=0

similarly, it has also 2 solutions

total sol.=4