Question:
Find the limit algebraically:
x→3limx3−27x2−9Answer:
To find the limit of a rational function as x approaches a certain value, we can simplify the function by factoring both the numerator and the denominator and then canceling out any common factors.
Given:
x→3limx3−27x2−9First, let's factor the numerator and denominator:
x→3lim(x−3)(x2+3x+9)(x−3)(x+3)Now, we can cancel out the common factor of (x−3):
x→3limx2+3x+9x+3Now we can substitute x=3 into the simplified function to find the limit:
x→3lim32+3(3)+93+3x→3lim276x→3lim92Therefore, the limit of the function as x approaches 3 is 92.