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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 72

Without solving the given quadratic equation, determine the number and type of solutions. 9x2=23x9x^2 = 2-3x

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1
Rewrite the given quadratic equation in standard form \(ax^2 + bx + c = 0\). Start by moving all terms to one side: \(9x^2 + 3x - 2 = 0\).
Identify the coefficients: \(a = 9\), \(b = 3\), and \(c = -2\).
Calculate the discriminant using the formula \(\Delta = b^2 - 4ac\).
Substitute the values into the discriminant formula: \(\Delta = (3)^2 - 4(9)(-2)\).
Analyze the discriminant value: if \(\Delta > 0\), there are two distinct real solutions; if \(\Delta = 0\), there is one real repeated 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.

Standard Form of a Quadratic Equation

A quadratic equation is typically written in the form ax² + bx + c = 0, where a, b, and c are constants. Converting the given equation into this form is essential for analyzing its properties, such as the number and type of solutions.
추천 영상:
04:34
Converting Standard Form to Vertex Form

Discriminant of a Quadratic Equation

The discriminant, given by Δ = b² - 4ac, determines the nature of the roots of a quadratic equation. If Δ > 0, there are two distinct real solutions; if Δ = 0, there is one real repeated solution; and if Δ < 0, there are two complex conjugate solutions.
추천 영상:
04:11
The Discriminant

Types of Solutions for Quadratic Equations

Quadratic equations can have real or complex solutions. Real solutions occur when the graph of the quadratic intersects the x-axis, while complex solutions occur when it does not. Understanding this helps in interpreting the discriminant without solving the equation.
추천 영상:
05:35
Introduction to Quadratic Equations