Mathematics
Grade 10
15 min
Complete a function table quadratic functions
Complete a function table quadratic functions
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Introduction & Learning Objectives
Learning Objectives
Define a quadratic function and identify its key components (a, b, c).
Substitute given input values (x) into a quadratic function to find the corresponding output values (y or f(x)).
Systematically complete a function table for a given quadratic equation over a specified domain.
Identify the vertex of a parabola from a completed function table by observing symmetry in the output values.
Use a completed function table to generate coordinate pairs for graphing a parabola.
Analyze the pattern of second differences in a function table to confirm that the function is quadratic.
Ever wondered how a basketball's arc is perfectly calculated for a swish? 🏀 That beautiful curve is a parabola, and you can map its path using a quadratic function table!
In thi...
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Key Concepts & Vocabulary
TermDefinitionExample
Quadratic FunctionA function that can be written in the standard form f(x) = ax² + bx + c, where a, b, and c are constants and 'a' is not equal to zero. Its graph is a U-shaped curve called a parabola.f(x) = 2x² - 3x + 5 is a quadratic function where a=2, b=-3, and c=5.
Function TableA table, often called a T-chart, that organizes the input values (x) and their corresponding output values (f(x) or y) for a given function.A table with two columns, one for 'x' values like -2, -1, 0, 1, 2 and another for the calculated 'f(x)' values.
Input (x-value)The independent variable in a function. These are the numbers you substitute into the quadratic equation to find the output.In the function f(x) = x² + 1, if you are asked to evaluate for x=3, th...
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Core Formulas
Standard Form of a Quadratic Function
f(x) = ax^2 + bx + c
This is the general formula for any quadratic function. To complete a function table, you substitute each given x-value into this formula to find its corresponding f(x) value. The value of 'a' determines if the parabola opens up (a > 0) or down (a < 0).
The Substitution Principle
To find f(k), replace every 'x' with '(k)'
This principle guides the evaluation process. To find the output for a specific input, you must replace every instance of the variable 'x' with the input value. Using parentheses around the substituted value, especially for negatives, is critical to avoid errors.
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Challenging
A function table for a parabola shows the points (0, 5), (1, 2), (2, 1), (3, 2), (4, 5). A student claims the vertex is at (2.5, 1.5). What is the actual vertex?
A.(1, 2)
B.(2, 1)
C.(3, 2)
D.(0, 5)
Challenging
A student creates a function table for f(x) = -x² + 4x + 1. Which of the following rows in their table contains a calculation error?
A.x = -1, f(x) = -4
B.x = 2, f(x) = 5
C.x = 3, f(x) = 4
D.x = 4, f(x) = 2
Challenging
The height `h` in meters of a thrown object after `t` seconds is h(t) = -5t² + 30t. A function table is created for t = {1, 2, 3, 4, 5}. Which output value from the table represents the maximum height reached by the object?
A.25
B.40
C.45
D.50
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