# Learn How to Find the Area Under the Graph of x Squared using a Definite Integral | Summary and Q&A

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October 19, 2020
by
The Math Sorcerer
Learn How to Find the Area Under the Graph of x Squared using a Definite Integral

## TL;DR

Calculating the area under a curve using definite integrals. The area under the curve of the function x² from 0 to 3 is 9.

## Key Insights

• ❓ The definite integral is used to find the area under a curve.
• 🧡 Limits of integration specify the range over which the area is being calculated.
• ✊ The power rule is a useful tool for integrating polynomials.
• 😀 The plus C term is not required in definite integrals.
• 😘 By plugging in the values at the upper and lower limits, the area under the curve can be determined.
• 👻 Calculus allows for the calculation of areas and volumes using integration.
• 💼 The definite integral gives a numerical value for the area, in this case, 9.

## Transcript

Read and summarize the transcript of this video on Glasp Reader (beta).

### Q: What is the purpose of a definite integral?

A definite integral is used to find the area under a curve between specified limits of integration. It calculates the net area between the curve and the x-axis.

### Q: Why is the definite integral called "definite"?

The definite integral is called "definite" because it has specific limits of integration that determine the range over which the area is being calculated.

### Q: What is the power rule used in this content?

The power rule is a basic rule of integration where the integral of xⁿ is (xⁿ⁺¹)/(n⁺¹). In this case, the function is x², so the integral is (x³)/3.

### Q: Why is the plus C term not included in the definite integral calculation?

In definite integrals, the plus C term is not necessary because it cancels out when subtracting the values at the upper limit from the values at the lower limit.

## Summary & Key Takeaways

• The content explains how to find the area under a curve using definite integrals, specifically using the function x² from 0 to 3.

• A sketch of the curve is drawn to visualize the area being calculated.

• The definite integral equation is set up with the limits of integration, function, and dx. The power rule is then used to solve the integral and find the area.