Which statement best describes the limit shown below?x→∞lim3log4x−5x8−3x23+4xThe limit equals zeroThe limit does not existThe limit exists and does not equal zero
Q. Which statement best describes the limit shown below?x→∞lim3log4x−5x8−3x23+4xThe limit equals zeroThe limit does not existThe limit exists and does not equal zero
Given Limit Expression: We are given the limit expression:\lim_{x \to \infty}(\-3x^{23} + 4^{x}) / (3\log_{4}x - 5x^{8})To find the behavior of this function as x approaches infinity, we need to determine the dominant terms in the numerator and the denominator.
Determining Dominant Terms: In the numerator, the dominant term is −3x23 because as x approaches infinity, x23 will grow much faster than 4x, which is exponential but does not depend on x in the base.In the denominator, the dominant term is −5x8 because as x approaches infinity, x8 will grow much faster than the logarithmic term 3log4x.So, we can simplify the limit to focus on the dominant terms in the numerator and the denominator:limx→∞(−5x8−3x23)
Simplifying the Limit: Now, we simplify the expression by dividing the coefficients and subtracting the exponents of x:(−3/−5)×x(23−8)=(3/5)×x15 As x approaches infinity, x15 will also approach infinity. Therefore, the limit of the simplified expression as x approaches infinity is also infinity.
Final Limit Evaluation: Since the limit of the simplified expression is ∞, the original limit also approaches ∞. This means that the limit does not equal 0 and it does exist, but it does not equal a finite number.Therefore, the correct statement is: The limit exists and does not equal 0.