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Find the limit, if it exists. \(\lim _{t \rightarrow 0} \frac{2 t^{3}+3 t^{2}}{3 t^{4}-2 t^{2}}\)

Short Answer

Expert verified
The limit exists and is equal to \(-\frac{3}{2}\).

Step by step solution

01

Factor the given expression

We need to factor the expression. To do so, we will factor the greatest common factor from both the numerator and the denominator: \[\frac{2 t^{3}+3 t^{2}}{3 t^{4}-2 t^{2}} = \frac{t^{2}(2t+3)}{t^{2}(3t^2-2)}\]
02

Simplify the expression

Now, we will simplify the expression by canceling out the common factor \(t^2\) from both the numerator and the denominator: \[\frac{t^{2}(2t+3)}{t^{2}(3t^2-2)} = \frac{2t+3}{3t^2-2}\]
03

Evaluate the limit

Now that we have simplified the expression, we can find the limit as t approaches 0: \[\lim_{t\to 0} \frac{2t+3}{3t^2-2} = \frac{2(0)+3}{3(0)^2-2} = \frac{3}{-2}\] So, the limit exists and is equal to \(\frac{3}{-2}\) or \(-\frac{3}{2}\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Factoring Expressions
Factoring expressions is a critical skill in algebra that enables you to simplify complex algebraic statements. This method involves breaking apart polynomials into products of simpler polynomials or numbers known as factors. When you factor an expression, you look for common elements in the terms, such as a common variable or a number that each term is divisible by. For instance, in the expression \(2t^3 + 3t^2\), you can see that each term is divisible by \(t^2\).

By factoring out \(t^2\), the expression simplifies to \(t^2(2t + 3)\). Such simplification is critical when you're working with limits, especially when you approach a value that results in an undefined form, like \(\frac{0}{0}\). Factoring expressions makes finding limits manageable, since it can eliminate these indeterminate forms, allowing you to progress to the next step, which is simplifying the expression.
Simplifying Expressions
Simplifying expressions is the process of reducing complexity while maintaining equivalence. It's akin to cleaning up an equation to make it more understandable and easier to work with. Once you've factored an expression, as seen in the previous section, you often find common factors in the numerator and the denominator.

For our example, after factoring, we obtained \(\frac{t^2(2t+3)}{t^2(3t^2-2)}\). We notice that \(t^2\) is a common factor in both the numerator and the denominator. By simplifying the expression, we cancel out this common term to get \(\frac{2t+3}{3t^2-2}\). Such a step is of paramount importance because it moves you one step closer to successfully evaluating the limit of the function without encountering indeterminate forms. Keep in mind, cancellation is only valid when the terms can be divided without remainder and, critically, are not equal to zero.
Evaluating Limits
Evaluating limits is a fundamental operation in calculus, essential for understanding the behavior of functions as variables approach a certain value. The goal is to discover what value the function tends to as the variable gets arbitrarily close to some target value. There are different strategies for evaluating limits, and one vital technique is simplifying expressions, as illustrated in earlier sections.

After simplifying the given function \(\frac{2t+3}{3t^2-2}\), it becomes significantly easier to evaluate the limit as \(t\) approaches the value of 0. You can directly substitute \(t=0\) into the simplified expression to find the limit. The result, which in this case is \(\frac{3}{-2}\), tells us the value that the function is heading towards. The ability to evaluate limits is crucial not just for finding instantaneous rates of change and areas under curves - the hearts of differential and integral calculus - but also for understanding continuous functions and the concept of convergence in mathematical analysis.

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Most popular questions from this chapter

The position function of an object moving along a straight line is given by \(s=f(t) .\) The average velocity of the object over the time interval \([a, b]\) is the average rate of change of f over \([a, b] ;\) its (instantaneous) velocity at \(t=a\) is the rate of change of \(\bar{f}\) at \(a .\) Velocity of a Ball Thrown into the Air A ball is thrown straight up with an initial velocity of \(128 \mathrm{ft} / \mathrm{sec}\), so its height (in feet) after \(t\) sec is given by \(s=f(t)=128 t-16 t^{2}\). a. What is the average velocity of the ball over the time intervals \([2,3],[2,2.5]\), and \([2,2.1] ?\) b. What is the instantaneous velocity at time \(t=2\) ? c. What is the instantaneous velocity at time \(t=5 ?\) Is the ball rising or falling at this time? d. When will the ball hit the ground?

Find the numbers, if any, where the function is discontinuous. \(f(x)=\left\\{\begin{array}{ll}x+2 & \text { if } x<3 \\ \ln (x-2)+5 & \text { if } x \geq 3\end{array}\right.\)

Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that shows it is false. If \(\lim _{x \rightarrow a} f(x)=L\), then given the number \(0.01\), there exists a \(\delta>0\) such that \(0<|x-a|<\delta\) implies that \(|f(x)-L|<0.01\)

Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that shows it is false. The limit of \(f(x)\) as \(x\) approaches \(a\) is \(L\) if for all \(\varepsilon>0\), there exists a \(\delta>0\) such that \(|f(x)-L|<\varepsilon\) whenever \(0<|x-a|<\delta\)

The position function of an object moving along a straight line is given by \(s=f(t) .\) The average velocity of the object over the time interval \([a, b]\) is the average rate of change of f over \([a, b] ;\) its (instantaneous) velocity at \(t=a\) is the rate of change of \(\bar{f}\) at \(a .\) During the construction of a high-rise building, a worker accidentally dropped his portable electric screwdriver from a height of \(400 \mathrm{ft}\). After \(t\) sec the screwdriver had fallen a distance of \(s=f(t)=16 t^{2} \mathrm{ft}\). a. How long did it take the screwdriver to reach the ground? b. What was the average velocity of the screwdriver during the time it was falling? c. What was the velocity of the screwdriver at the time it hit the ground?

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