Math Problem Statement
f(x)=3x^2-x-2 (a) Is the point (-1,2) on the graph of f? (b) If x = 2, what is f(x)? What point is on the graph of f? (c) If f(x) = negative 2, what is x? What point(s) is/are on the graph of f? (d) What is the domain of f? (e) List the x-intercept(s), if any, of the graph of f. (f) List the y-intercept, if there is one, of the graph of f.
Solution
Let's address each part of the question one by one for the function .
(a) Is the point on the graph of ?
To determine if the point is on the graph, substitute into the function and see if :
Since , the point is indeed on the graph of .
(b) If , what is ? What point is on the graph of ?
Substitute into the function:
So, . The point is on the graph of .
(c) If , what is ? What point(s) is/are on the graph of ?
Set and solve for :
Adding 2 to both sides:
Factor the equation:
So, or .
The points on the graph are and .
(d) What is the domain of ?
The domain of a quadratic function is all real numbers since there are no restrictions on the values that can take. Thus, the domain of is .
(e) List the -intercept(s), if any, of the graph of .
To find the -intercepts, set and solve for :
Use the quadratic formula:
Where , , and :
So:
The -intercepts are and .
(f) List the -intercept, if there is one, of the graph of .
To find the -intercept, set and solve for :
The -intercept is .
Would you like more details or have any questions? Here are some related questions you might find interesting:
- How do you determine the vertex of the quadratic function ?
- What is the axis of symmetry for the function ?
- How do you graph the function ?
- What are the maximum and minimum values of the function ?
- How does changing the coefficients of , , and the constant term affect the shape and position of the parabola?
Tip: When solving quadratic equations, always check if they can be factored easily before using the quadratic formula—it can save time!
Ask a new question for Free
By Image
Drop file here or Click Here to upload
Math Problem Analysis
Mathematical Concepts
Quadratic Functions
Graphing
Intercepts
Domain
Formulas
Quadratic formula
Theorems
-
Suitable Grade Level
Grades 9-12
Related Recommendation
Quadratic Function Analysis of f(x) = 3x^2 - x - 2
Solving and Graphing the Quadratic Function f(x) = 3x² - x - 2
Solving Quadratic Functions and Intercepts: f(x) = 3x^2 - x - 2
Plotting the Quadratic Function f(x) = 3x^2 - 2: Step-by-Step Guide
Quadratic Function f(x) = 2x^2 - 3x - 2: Solution and Analysis