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Ch. 2 - Graphs and Functions
Lial - College Algebra 13th Edition
Lial13th EditionCollege AlgebraISBN: 9780136881063Not the one you use?Change textbook
Chapter 3, Problem 119

Use the table to evaluate each expression, if possible.
(ƒ+g)(1)(ƒ+g)(1)
(ƒ+g)(1)

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1
Identify the functions ƒ and g from the given table. The table should provide values of ƒ(x) and g(x) for various x, including x = 1.
Locate the value of ƒ(1) in the table by finding the row where x = 1 and noting the corresponding ƒ(x) value.
Locate the value of g(1) in the table by finding the row where x = 1 and noting the corresponding g(x) value.
Add the two values together to find (ƒ + g)(1), using the formula: \[(ƒ + g)(1) = ƒ(1) + g(1)\]
If either ƒ(1) or g(1) is not available in the table, then (ƒ + g)(1) cannot be evaluated.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Function Notation and Evaluation

Function notation, such as f(x), represents the output of a function f for an input x. Evaluating a function at a specific value means substituting that value into the function to find the corresponding output. For example, f(1) means finding the value of f when x = 1.
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Operations on Functions

Operations on functions include addition, subtraction, multiplication, and division of two functions. For (f + g)(x), you add the outputs of f(x) and g(x) for the same input x. This means (f + g)(1) = f(1) + g(1), combining the values from each function at x = 1.
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Multiplying & Dividing Functions

Using Tables to Evaluate Functions

When functions are given in table form, you find the function value by locating the input in the table and reading the corresponding output. To evaluate (f + g)(1), find f(1) and g(1) from the table, then add these values. If either value is missing, the expression cannot be evaluated.
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