Find all real roots of the equation x^4 − 5x^2 + 4 = 0.
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Get StartedFind all real roots of the equation x^4 − 5x^2 + 4 = 0.
Options:
- −2, −1, 1, 2
- −4, −1, 1, 4
- −√5, −1, 1, √5
- −3, −1, 1, 3
Correct answer: −2, −1, 1, 2
Explanation: Let y = x^2 giving y^2 − 5y + 4 = 0 with y = 1 or 4, so x = ±1 or ±2; the real roots are −2, −1, 1, 2, four concrete values.
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