Which statement best describes the limit shown below?x→∞lim3x38+5x38−7lnxThe limit equals zeroThe limit does not existThe limit exists and does not equal zero
Q. Which statement best describes the limit shown below?x→∞lim3x38+5x38−7lnxThe limit equals zeroThe limit does not existThe limit exists and does not equal zero
Identify Denominator: We are given the limit expression limx→∞(3x38+5x38−7lnx). To find the limit as x approaches infinity, we need to analyze the behavior of the numerator and the denominator separately.
Combine Like Terms: First, let's look at the denominator: 3x38+5x38. We can combine like terms by adding the coefficients of the x38 terms.3x38+5x38=(3+5)x38=8x38.
Analyze Behavior: Now, we have the limit expression simplified to limx→∞(8x38−7lnx). The next step is to recognize that as x approaches infinity, the natural logarithm function lnx grows without bound, but at a much slower rate than any positive power of x.
Recognize Growth Rates: Since the denominator contains x raised to the 38th power, it will grow much faster than the natural logarithm in the numerator as x approaches infinity. This means that the fraction as a whole will approach zero.
Determine Limit: Therefore, the limit of 8x38−7lnx as x approaches infinity is 0 because the denominator increases much faster than the numerator.