解答
Sum of the roots: $r_1 + r_2 = -\frac{b}{a}$. Product of the roots: $r_1 \cdot r_2 = \frac{c}{a}$.
解説
Vieta's formulas bypass factoring or the quadratic formula when the question asks for the sum or product of solutions, saving significant time.
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What are Vieta's formulas for the sum and product of the roots of a quadratic equation $ax^2 + bx + c = 0$?
デッキ「Digital SAT Math: Algebra, Advanced Math & Geometry」の単語カード。