If a, b, c are positive real numbers in 9x² + bx + c = 0 the root will be _____?
- Negative real numbers
- Positive real numbers
- Imaginary
- None of these
Explanation
In ax² + bx + c = 0, if > 0, b > 0, and c > 0, the parabola opens upward and lies entirely above the x-axis unless discriminant D = b² - 4ac ≥ 0.
If real roots exist, they are negative because both b and c are positive.
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