Solve the inequality x2−4x+3x2+1≤0\frac{x^2 - 4x + 3}{x^2 + 1} \leq 0x2+1x2−4x+3≤0.
1≤x≤31 \leq x \leq 31≤x≤3
x≤1x \leq 1x≤1 or x≥3x \geq 3x≥3
x≤3x \leq 3x≤3
All real numbers