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Ch. 6 - Applications of Integration
Briggs - Calculus: Early Transcendentals 3rd Edition
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBriggs 3rd EditionCh. 6 - Applications of IntegrationProblema 6.2.34a
Capitolo 6, Problema 6.2.34a

For the given regions R₁ and R₂, complete the following steps.


a. Find the area of region R₁.


R₁ is the region in the first quadrant bounded by the y-axis and the curves y=2x^2 and y=3−x; R₂ is the region in the first quadrant bounded by the x-axis and the curves y=2x^2 and y=3−x(see figure).
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Step 1: Identify the boundaries of region R₁. Region R₁ is bounded by the y-axis (x = 0), the curve y = 2x², and the line y = 3 − x. To find the area, we need to determine the points of intersection between y = 2x² and y = 3 − x.
Step 2: Solve for the points of intersection by equating the two equations: 2x² = 3 − x. Rearrange this into a standard quadratic form: 2x² + x − 3 = 0. Use the quadratic formula or factorization to find the values of x where the curves intersect.
Step 3: Set up the integral to calculate the area of R₁. The area is given by the integral of the top curve minus the bottom curve over the interval determined by the points of intersection. Specifically, the integral is: ∫[0, x₁] ((3 − x) − (2x²)) dx, where x₁ is the x-coordinate of the intersection point.
Step 4: Break down the integral into simpler components. Expand the integrand: (3 − x − 2x²). Compute the integral term by term: ∫[0, x₁] 3 dx, ∫[0, x₁] −x dx, and ∫[0, x₁] −2x² dx.
Step 5: Evaluate each integral over the interval [0, x₁] and combine the results to find the total area of region R₁. This will give the area enclosed by the curves and the y-axis.

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Definite Integrals

Definite integrals are used to calculate the area under a curve between two points on the x-axis. In this context, the area of region R₁ can be found by integrating the difference between the upper curve (y = 3 - x) and the lower curve (y = 2x²) over the interval defined by their intersection points. This process quantifies the total area enclosed by the curves.
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Percorso guidato
05:43
Definition of the Definite Integral

Finding Intersection Points

To determine the area of region R₁, it is essential to find the intersection points of the curves y = 2x² and y = 3 - x. These points are where the two curves meet, and they define the limits of integration for calculating the area. Solving the equation 2x² = 3 - x will yield the x-values at which the curves intersect.
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Critical Points

Area Between Curves

The area between two curves is calculated by integrating the difference of the functions that define the curves over a specified interval. For region R₁, the area can be expressed as the integral of (3 - x - 2x²) dx, evaluated from the left intersection point to the right intersection point. This method effectively captures the space between the two curves.
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Finding Area Between Curves on a Given Interval
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