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Ch. 1 - Equations and Inequalities
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514당신이 사용하는 게 아니라요?교과서 변경
2장, 문제 77

In Exercises 75–82, compute the discriminant. Then determine the number and type of solutions for the given equation. 2x211x+3=02x^2 - 11x + 3 = 0

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1
Identify the coefficients in the quadratic equation \(2x^2 - 11x + 3 = 0\). Here, \(a = 2\), \(b = -11\), and \(c = 3\).
Recall the formula for the discriminant: \(\Delta = b^2 - 4ac\).
Substitute the values of \(a\), \(b\), and \(c\) into the discriminant formula: \(\Delta = (-11)^2 - 4 \times 2 \times 3\).
Simplify the expression to find the value of the discriminant (do not calculate the final number yet).
Use the value of the discriminant to determine the number and type of solutions: if \(\Delta > 0\), there are two distinct real solutions; if \(\Delta = 0\), there is one real solution; if \(\Delta < 0\), there are two complex solutions.

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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 its coefficients.
추천 영상:
05:35
Introduction to Quadratic Equations

Discriminant

The discriminant is the part of the quadratic formula under the square root, given by b² - 4ac. It determines the nature and number of solutions of a quadratic equation: if positive, two distinct real solutions; if zero, one real repeated solution; if negative, two complex solutions.
추천 영상:
04:11
The Discriminant

Types of Solutions of Quadratic Equations

The solutions of a quadratic equation can be real or complex. Based on the discriminant, the equation may have two distinct real roots, one repeated real root, or two complex conjugate roots. Understanding these types helps in interpreting the behavior of the quadratic function.
추천 영상:
05:35
Introduction to Quadratic Equations