Evaluate the discriminant for each equation. Then use it to determine the number of distinct solutions, and tell whether they are rational, irrational, or nonreal complex numbers. (Do not solve the equation.) 3x2 + 5x + 2 = 0
Table of contents
- 0. Review of Algebra4h 18m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations1h 43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 5m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 22m
- 10. Combinatorics & Probability1h 45m
1. Equations & Inequalities
The Square Root Property
Problem 77
Textbook Question
Solve each equation for the specified variable. (Assume no denominators are 0.) See Example 8.
, for t
Verified step by step guidance1
Start with the given equation: \(h = -16t^2 + v_0 t + s_0\).
Rearrange the equation to set it equal to zero by subtracting \(h\) from both sides: \$0 = -16t^2 + v_0 t + s_0 - h$.
Rewrite the equation in standard quadratic form: \(-16t^2 + v_0 t + (s_0 - h) = 0\).
Identify the coefficients for the quadratic formula: \(a = -16\), \(b = v_0\), and \(c = s_0 - h\).
Use the quadratic formula to solve for \(t\): \(t = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\), substituting the values of \(a\), \(b\), and \(c\).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Solving Quadratic Equations
A quadratic equation is a polynomial equation of degree two, typically in the form ax^2 + bx + c = 0. To solve for the variable, methods such as factoring, completing the square, or using the quadratic formula can be applied. Recognizing the equation's structure is essential for choosing the appropriate method.
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Isolating the Variable
Isolating the variable means manipulating the equation to express the variable explicitly on one side. This often involves algebraic operations like addition, subtraction, multiplication, division, and factoring. The goal is to rewrite the equation so the variable is alone, making it easier to solve.
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Equations with Two Variables
Understanding the Context of the Equation
The given equation h = -16t^2 + v_0t + s_0 models the height of an object under gravity over time. Recognizing that t represents time and that the equation is quadratic helps in interpreting solutions physically, such as identifying valid time values and excluding non-physical results like negative time.
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