Evaluate the following limits:
As we need to find
We can directly find the limiting value of a function by putting the value of the variable at which the limiting value is asked if it does not take any indeterminate form (0/0 or ∞/∞ or ∞-∞, .. etc.)
Let Z
∴ we need to take steps to remove this form so that we can get a finite value.
TIP: Most of the problems of logarithmic and exponential limits are solved using the formula and
This question is a direct application of limits formula of exponential and logarithmic limits.
To get the desired forms, we need to include mx and nx as follows:
As Z
⇒ Z
{Adding and subtracting 1 in numerator}
⇒ Z
{using algebra of limits}
To get the form as present in the formula we multiply and divide m and n into both terms respectively:
∴ Z
Use the formula:
∴ Z = m log a – n log b
{using properties of log}
Hence,