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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
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