Q. Find limx→∞x3−5x4+2x.Choose 1 answer:(A) 2(B) 0(C) −5(D) The limit is unbounded
Analyze Behavior: To find the limit of the given function as x approaches infinity, we need to analyze the behavior of the numerator and the denominator separately. The highest power of x in both the numerator and the denominator will dominate the behavior of the function as x becomes very large.
Divide by Highest Power: The highest power of x in the numerator is x4, and the highest power of x in the denominator is x3. To simplify the limit, we can divide both the numerator and the denominator by x3, the highest power of x in the denominator.
Simplify Numerator: Dividing each term in the numerator by x3 gives us:(−5x4)/x3+(2x)/x3This simplifies to:−5x+x22
Take Limits: Now, we take the limit of each term as x approaches infinity: limx→∞(−5x)=−5×limx→∞(x)=−5×∞=−∞limx→∞(x22)=2×limx→∞(x21)=2×0=0
Add Limits: Adding the limits of the individual terms, we get: limx→∞(−5x+x22)=−∞+0=−∞
Final Answer: Since the limit of the function as x approaches ∞ is −∞, the limit is unbounded. Therefore, the correct answer is:(D) The limit is unbounded
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