For ax² + bx + c, the sum of roots equals:
Ab/a
B−c/a
Cc/a
D−b/a
Answer & Solution
Correct answer: D. −b/a
To find the sum of the roots of a quadratic equation in the standard form $ax^2 + bx + c = 0$, we use **Vieta's Formulas**.
1. **Identify the coefficients**: The coefficients of the quadratic equation are $a$ (leading coefficient), $b$ (linear coefficient), and $c$ (constant term).
2. **State Vieta's Formulas**: For any quadratic equation with roots $r_1$ and $r_2$:
- The sum of roots is $r_1 + r_2 = -\frac{b}{a}$
- The product of roots is $r_1 \cdot r_2 = \frac{c}{a}$
3. **Conclusion**: Based on these mathematical relationships, the sum of roots is always represented by the formula $-\frac{b}{a}$.
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