L'Hôpital's Pronunciation:

We pronounce this as Lo-pital

L'Hopital's Rule Definition:

The limit of a quotient
equals
limit of derivative of quotients.
We use L'Hôpital's Rule for:
indeterminate limits of quotients
0/0, or ∞/∞

L'Hopital's Rule Notation:

limx → c ƒ(x)/g(x) = limx → c ƒ'(x)/g'(x)

L'Hopital's Rule Example:

ƒ(x)  =  x4 - 81
  x - 3

Taking the limit as x goes to 3:

34 - 81
3 - 3

81 - 81
0

0
0

Since the limit is indeterminate
we can use L'Hôpital's Rule

Taking the limit as x goes to 3:

ƒ'(x)
g'(x)
=
  
4x3
1

ƒ'(x)
g'(x)
=
  
4 * 33
1

ƒ'(x)
g'(x)
=
  
4 * 27
1

limx → 3 ƒ'(x)/g'(x) = 108


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Other Resources:

limit of a function lesson
derivative calculator


How does the L'Hôpital's Rule Calculator work?
Free L'Hôpital's Rule Calculator - This lesson walks you through L'Hôpitals's Rule including the definition, pronunciation, notation, and examples

What 1 formula is used for the L'Hôpital's Rule Calculator?

limx → c ƒ(x)/g(x) = limx → c ƒ'(x)/g'(x)

For more math formulas, check out our Formula Dossier

What 8 concepts are covered in the L'Hôpital's Rule Calculator?

constant
a value that always assumes the same value independent of how its parameters are varied
derivative
rate at which the value y of the function changes with respect to the change of the variable x
exponent
The power to raise a number
fraction
how many parts of a certain size exist
a/b where a is the numerator and b is the denominator
function
relation between a set of inputs and permissible outputs
ƒ(x)
limit
the value that a function (or sequence) approaches as the input (or index) approaches some valu
power
how many times to use the number in a multiplication
variable
Alphabetic character representing a number

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