Math Problem Statement

 solve gradient of the tangent line of lnx that passes a point (-2,-1)

Solution

To solve for the gradient (slope) of the tangent line to the curve y=ln(x)y = \ln(x) that passes through the point (2,1)(-2, -1), let’s break this into clear steps:


1. The function and its derivative

The gradient of the tangent line is determined by the derivative of y=ln(x)y = \ln(x): y=1x.y' = \frac{1}{x}.


2. Issue with ln(x)\ln(x) for negative xx

The natural logarithm function ln(x)\ln(x) is only defined for x>0x > 0. Since the given point (2,1)(-2, -1) has x=2x = -2, ln(x)\ln(x) cannot be evaluated at this point. Therefore, there is no tangent line to y=ln(x)y = \ln(x) that passes through this point.


Clarification:

If this was a misinterpretation, and the intention is to find the tangent to another curve (or confirm the problem setup), please clarify.

Would you like to adjust the problem statement, or should I assist further in refining this calculation?


Related Questions:

  1. How is the natural logarithm function defined and restricted?
  2. Can tangent lines pass through points outside the domain of the original function?
  3. What is the slope of a tangent to ln(x)\ln(x) at a positive xx-coordinate?
  4. How can we extend ln(x)\ln(x) to complex numbers and explore tangents?
  5. What are the implications of domain and range in logarithmic functions?

Tip:

Always verify the domain of a function before working with tangent lines or evaluating points!

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Math Problem Analysis

Mathematical Concepts

Calculus
Logarithmic Functions
Tangent Lines
Domain and Range

Formulas

y = ln(x)
y' = 1/x

Theorems

Definition and Domain of Natural Logarithmic Function

Suitable Grade Level

Grades 11-12