|In Exercises 45-48, find the directional derivative fa (1,2) for the function f with i = (37 – 47 )/5.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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In Exercises 45-48, find the directional derivative \( f_i(1, 2) \) for the function \( f \) with \(\vec{u} = (3\vec{i} - 4\vec{j})/5\).
Transcribed Image Text:In Exercises 45-48, find the directional derivative \( f_i(1, 2) \) for the function \( f \) with \(\vec{u} = (3\vec{i} - 4\vec{j})/5\).
The image contains two mathematical expressions of functions:

1. **Function 45:**  
   \( f(x, y) = xy + y^3 \)

2. **Function 47:**  
   \( f(x, y) = x^2 - y^2 \)

These functions represent multivariable mappings, where each function defines a relationship between two variables \( x \) and \( y \). The expressions demonstrate different types of operations, such as multiplication and exponentiation, applied to these variables.
Transcribed Image Text:The image contains two mathematical expressions of functions: 1. **Function 45:** \( f(x, y) = xy + y^3 \) 2. **Function 47:** \( f(x, y) = x^2 - y^2 \) These functions represent multivariable mappings, where each function defines a relationship between two variables \( x \) and \( y \). The expressions demonstrate different types of operations, such as multiplication and exponentiation, applied to these variables.
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