Solve each quadratic equation using the quadratic formula. See Example 7. x² - 2x - 2 = 0

검증된 단계별 안내

Identify the coefficients in the quadratic equation \(x^2 - 2x - 2 = 0\). Here, \(a = 1\), \(b = -2\), and \(c = -2\).

Recall the quadratic formula: \(x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\).

Substitute the values of \(a\), \(b\), and \(c\) into the quadratic formula: \(x = \frac{-(-2) \pm \sqrt{(-2)^2 - 4 \times 1 \times (-2)}}{2 \times 1}\).

Simplify inside the square root (the discriminant): calculate \(b^2 - 4ac = (-2)^2 - 4 \times 1 \times (-2)\).

Evaluate the entire expression step-by-step to find the two possible values of \(x\) by considering both the plus and minus signs in the formula.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Quadratic Equation

A quadratic equation is a second-degree polynomial equation in the form ax² + bx + c = 0, where a, b, and c are constants and a ≠ 0. It represents a parabola when graphed and can have zero, one, or two real solutions depending on the discriminant.

Quadratic Formula

The quadratic formula x = (-b ± √(b² - 4ac)) / (2a) provides the solutions to any quadratic equation ax² + bx + c = 0. It uses the coefficients a, b, and c to find the roots, including real and complex solutions, based on the discriminant.

Discriminant

The discriminant, given by b² - 4ac, determines the nature of the roots of a quadratic equation. If positive, there are two distinct real roots; if zero, one real root; and if negative, two complex conjugate roots. It guides the interpretation of solutions.