All flashcards
Flashcard 1: How is the left-hand limit of f(x) as x approaches a denoted?
Answer: limx→a−f(x). The − superscript indicates approaching from values less than a.
Flashcard 2: Identify the limit law for the constant multiple of a function.
Answer: limx→a[c⋅f(x)]=c⋅limx→af(x). Constants can be factored out of limit expressions.
Flashcard 3: What is the limit of f(x)=c as x approaches any a?
Answer: c. Constant functions have limits equal to the constant value everywhere.
Flashcard 4: State the limit law for the product of two functions.
Answer: limx→a[f(x)⋅g(x)]=limx→af(x)⋅limx→ag(x). Limit of product equals product of limits when both individual limits exist.
Flashcard 5: What does it mean if limx→af(x)=L?
Answer: As x approaches a, f(x) approaches L. The function value gets arbitrarily close to L as input approaches a.
Flashcard 6: Evaluate limx→0xsinx.
Answer:
- This is a fundamental trigonometric limit used in calculus.
Flashcard 7: What is the condition for the existence of a two-sided limit?
Answer: Both one-sided limits must exist and be equal. When limx→a+f(x)=limx→a−f(x), the two-sided limit exists.
Flashcard 8: Identify the limit of x1 as x approaches 0 from the right.
Answer: ∞. As x approaches 0+, x1 becomes arbitrarily large and positive.
Flashcard 9: How is the right-hand limit of f(x) as x approaches a denoted?
Answer: limx→a+f(x). The + superscript indicates approaching from values greater than a.
Flashcard 10: Evaluate limx→∞x33x3+x+2.
Answer:
- Divide numerator and denominator by x3; limit of x33x3=3.
Flashcard 11: State the limit law for powers of a function.
Answer: limx→a[f(x)]n=[limx→af(x)]n. Limit of power equals power of limit when the base limit exists.
Flashcard 12: State the limit law for the difference of two functions.
Answer: limx→a[f(x)−g(x)]=limx→af(x)−limx→ag(x). Limit of difference equals difference of limits when both individual limits exist.
Flashcard 13: Evaluate limx→−1(x3+2x2+x).
Answer:
- Direct substitution: (−1)3+2(−1)2+(−1)=−1+2−1=0.
Flashcard 14: What is the definition of a limit in calculus?
Answer: The value a function approaches as the input approaches a point. This captures the fundamental concept of approaching a value without necessarily reaching it.
Flashcard 15: What is a one-sided limit?
Answer: The limit of a function as x approaches a point from one side, either the left or the right. Considers approach from only left (a−) or right (a+) side of the point.
Flashcard 16: What is the limit notation for f(x) as x approaches infinity?
Answer: limx→∞f(x). Examines function behavior as input values become arbitrarily large.
Flashcard 17: How is an infinite limit denoted?
Answer: limx→af(x)=∞ or −∞. Uses infinity symbol to show unbounded growth in positive or negative direction.
Flashcard 18: State the limit law for the quotient of two functions.
Answer: limx→ag(x)f(x)=limx→ag(x)limx→af(x), if limx→ag(x)=0. Limit of quotient equals quotient of limits when denominator limit is nonzero.
Flashcard 19: Evaluate limx→∞2x2+35x2−4x.
Answer: 25. Divide by highest power x2: 2+x235−x4→25.
Flashcard 20: Identify the limit of x1 as x approaches 0 from the left.
Answer: −∞. As x approaches 0−, x1 becomes arbitrarily large and negative.
Flashcard 21: If limx→af(x)=L, what is the relationship between f(x) and L?
Answer: As x approaches a, f(x) gets arbitrarily close to L. The function output approaches L but doesn't necessarily equal L at x=a.
Flashcard 22: Evaluate limx→3(x2−9).
Answer:
- Direct substitution: (3)2−9=9−9=0.
Flashcard 23: What does continuity at a point x=a require?
Answer: f(a) is defined, limx→af(x) exists, and limx→af(x)=f(a). Three conditions ensure no gaps, jumps, or undefined points.
Flashcard 24: What is the limit of f(x)=x as x approaches a?
Answer: a. The identity function f(x)=x approaches the point value.
Flashcard 25: How is the limit of a function as x approaches a denoted?
Answer: limx→af(x). Standard mathematical notation using lim with subscript showing the approach.
Flashcard 26: What is an infinite limit?
Answer: A limit where f(x) increases or decreases without bound as x approaches a point. Function values grow without bound, approaching positive or negative infinity.
Flashcard 27: State the limit law for the sum of two functions.
Answer: limx→a[f(x)+g(x)]=limx→af(x)+limx→ag(x). Limit of sum equals sum of limits when both individual limits exist.
Flashcard 28: Evaluate limx→1x−1x2−1.
Answer:
- Factor as x−1(x+1)(x−1), cancel to get x+1, then substitute x=1.
Flashcard 29: Evaluate limx→∞(2x2+3x+1).
Answer: ∞. Polynomial with positive leading coefficient grows without bound as x→∞.
Flashcard 30: What is the formal name for limx→a+f(x) and limx→a−f(x)?
Answer: Right-hand limit and left-hand limit, respectively. These describe approaches from the positive and negative sides respectively.