Substituting t = x²: t = 1 or 4 → x = ±1, ±2 → 4 real roots.
The number of real roots of the equation x⁴ - 5x² + 4 = 0 is:
JEE Advanced 2026 — Mathematics Algebra
2026mcqmedium
The number of real roots of the equation x⁴ - 5x² + 4 = 0 is:
Official previous-year question
Verified 30 May 2026.
Options
- A
0
- B
2
- C
4
- D
1
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