Math Problem Statement

Apply L'Hôpital's rule.

lim x→2 

x + 47

 − 7

x − 2

 = 

lim x→2 

d

dx

x + 47

 −  

d

dx

(x −  )

 = 

lim x→2 

1   x + 47

(  )

 = 

1

lim x→2 

1

x + 47

Solution

Let's apply L'Hôpital's Rule to evaluate the limit.

Given limit:

limx2x+477x2\lim_{{x \to 2}} \frac{x + 47 - 7}{x - 2}

First, simplify the expression:

limx2x+40x2\lim_{{x \to 2}} \frac{x + 40}{x - 2}

As we discussed earlier, directly substituting x=2x = 2 gives a division by zero, indicating that L'Hôpital's Rule may be applied. L'Hôpital's Rule states that if a limit results in an indeterminate form like 00\frac{0}{0} or \frac{\infty}{\infty}, we can evaluate the limit of the derivatives of the numerator and denominator.

Differentiate the numerator and the denominator separately with respect to xx:

  1. The derivative of the numerator x+40x + 40 is 11.
  2. The derivative of the denominator x2x - 2 is also 11.

Now, apply L'Hôpital's Rule:

limx2d/dx(x+40)d/dx(x2)=limx211=1\lim_{{x \to 2}} \frac{d/dx \, (x + 40)}{d/dx \, (x - 2)} = \lim_{{x \to 2}} \frac{1}{1} = 1

Thus, the limit is:

limx2x+40x2=1\lim_{{x \to 2}} \frac{x + 40}{x - 2} = 1

Would you like more details or have any questions?


Here are 5 related questions you might find helpful:

  1. When should L'Hôpital's Rule be applied?
  2. Can L'Hôpital's Rule be applied to limits involving \infty?
  3. What are other methods to evaluate limits besides L'Hôpital's Rule?
  4. How does L'Hôpital's Rule apply to higher-order derivatives?
  5. What are common pitfalls when using L'Hôpital's Rule?

Tip: Always check that the limit is in an indeterminate form before applying L'Hôpital's Rule. If it is not, L'Hôpital's Rule cannot be applied correctly.

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Math Problem Analysis

Mathematical Concepts

Limits
L'Hôpital's Rule

Formulas

-

Theorems

L'Hôpital's Rule

Suitable Grade Level

Advanced High School