Question

calculates the exact area under the curve using Riemann sums of f(x)= 4-x2 on an interval [ 1,2]

251

likes
1254 views

Answer to a math question calculates the exact area under the curve using Riemann sums of f(x)= 4-x2 on an interval [ 1,2]

Expert avatar
Dexter
4.7
109 Answers
Para calcular el área exacta bajo la curva mediante sumas de Riemann de la función f(x) = 4 - x^2 en el intervalo [1,2], vamos a seguir los siguientes pasos:

Paso 1: Dividir el intervalo [1,2] en subintervalos iguales. Vamos a elegir n subintervalos para aproximar el área.

Paso 2: Calcular el ancho de cada subintervalo. Encuentra el valor de \Delta x dividiendo la longitud del intervalo (2 - 1) entre n, es decir, \Delta x = \frac{{2 - 1}}{n}.

Paso 3: Determinar los puntos de evaluación. Escoge un punto dentro de cada subintervalo para evaluar la función. Aquí utilizaremos el punto medio de cada subintervalo.

Paso 4: Calcular el área aproximada bajo la curva. Para cada subintervalo, calculamos el área de un rectángulo cuya altura es el valor de la función evaluada en el punto medio del subintervalo, y cuya base es el ancho del subintervalo. Luego, sumamos todas estas áreas de los rectángulos para obtener una aproximación del área bajo la curva.

Paso 5: Tomar el límite cuando n tiende a infinito. A medida que aumentamos el número de subintervalos, la aproximación del área se vuelve más precisa. Tomando el límite cuando n tiende a infinito, obtendremos el área exacta bajo la curva.

Ahora vamos a calcular el área exacta utilizando los métodos de sumas de Riemann:

Paso 1: Dividir el intervalo [1,2] en subintervalos iguales. Tomaremos n subintervalos.

Paso 2: Calcular el ancho de cada subintervalo. Tenemos \Delta x = \frac{{2 - 1}}{n} = \frac{1}{n}.

Paso 3: Determinar los puntos de evaluación. Utilizaremos el punto medio de cada subintervalo.

Paso 4: Calcular el área aproximada bajo la curva. Para cada subintervalo i, el punto de evaluación será x_i^* = 1 + \frac{\Delta x}{2} + i \cdot \Delta x, y el área del rectángulo correspondiente será A_i = f(x_i^*) \cdot \Delta x. Entonces, el área aproximada A será la suma de todas estas áreas:

A = \sum_{i=0}^{n-1} A_i = \sum_{i=0}^{n-1} f\left(1 + \frac{\Delta x}{2} + i \cdot \Delta x\right) \cdot \Delta x

El límite de esta suma cuando n tiende a infinito nos dará el área exacta bajo la curva.

Paso 5: Tomar el límite cuando n tiende a infinito. Es decir:

\lim_{{n \to \infty}} \sum_{i=0}^{n-1} f\left(1 + \frac{\Delta x}{2} + i \cdot \Delta x\right) \cdot \Delta x

Para calcular el límite de esta suma, podemos utilizar el teorema fundamental del cálculo o notar que la función f(x) = 4 - x^2 es continua en el intervalo [1,2] y, por lo tanto, integrable. Por lo tanto, el área exacta bajo la curva se puede calcular mediante la integral definida de la función en el intervalo [1,2]:

A = \int_{1}^{2} (4 - x^2) \, dx

Ahora podemos proceder a calcular la integral para obtener el área exacta:

\int_{1}^{2} (4 - x^2) \, dx = \left[ 4x - \frac{x^3}{3} \right]_{1}^{2}

Evaluamos la integral en los límites de integración:

= \left[ 4(2) - \frac{(2)^3}{3} \right] - \left[ 4(1) - \frac{(1)^3}{3} \right]

= \left[ 8 - \frac{8}{3} \right] - \left[ 4 - \frac{1}{3} \right]

= \left[ \frac{24}{3} - \frac{8}{3} \right] - \left[ \frac{12}{3} - \frac{1}{3} \right]

= \frac{16}{3} - \frac{11}{3}

= \frac{5}{3}

Entonces, el área exacta bajo la curva f(x) = 4 - x^2 en el intervalo [1,2] es \frac{5}{3}.

\textbf{Respuesta:} El área exacta bajo la curva mediante sumas de Riemann de f(x) = 4 - x^2 en el intervalo [1,2] es \frac{5}{3}.

Frequently asked questions (FAQs)
What is the maximum value of the function f(x) = x^3 - 6x^2 + 9x - 2 on the interval [0, 4]?
+
Math question: Find the factors of 36 using the Factoring formula.
+
Find the value of x if 2x + 4 = 10.
+
New questions in Mathematics
Karina has a plot of 5000 square meters in which she has decided that 60% of it will be used to plant vegetables. Of this part, 12% will be dedicated to planting lettuce. How much surface area of the plot will be used to grow lettuce?
How many kilometers does a person travel in 45 minutes if they move at a rate of 8.3 m/s?
4.2x10^_6 convert to standard notation
A soft drink machine outputs a mean of 23 ounces per cup. The machines output is normally distributed with a standard deviation of 3 ounces. What is the probability of filling a cup between 26 and 28 ounces round your answer to four decimal places
Sean must chose a 6- digit PIN number for his online banking account.Each digit can be chosen from 0 to 9. How many different possible PIN numbers can sean chose.
Given (3x+2)E [2;14] how much money (in soles) does Sophia have if numerically it is the greatest value of x?
Convert 5/9 to a decimal
Professor Vélez has withdrawn 40 monthly payments of $3,275 from her investment account. If the investment account yields 4% convertible monthly, how much did you have in your investment account one month before making the first withdrawal? (Since you started making withdrawals you have not made any deposits.)
At the dance there are 150 boys the rest are girls. If 65% are girls what is the total amount in the room
If the regression equation is given by 4x –y + 5 = 0, then the slope of regression line of y on x is
List five numbers that belong to the 5 (mod 6) numbers. Alternate phrasing, list five numbers that satisfy equation x = 5 (mod 6)
A car travels 211 miles on 15 gallons of gasoline. The best estimate of the car’s miles per gallon is?
A company made 150,000 in the first year 145,000 in the second 140,000 in the third year successively during the first decade of this company's existence it made a total of
Let f and g be defined in R and suppose that there exists M > 0 such that |f(x) − f(p)| ≤ M|g(x) − g(p)|, for all x. Prove that if g is continuous in p, then f will also be continuous in p.
prove that for sets SS, AA, BB, and CC, where AA, BB, and CC are subsets of SS, the following equality holds: (A−B)−C=(A−C)−(B−C)
What is the percentage of nitrogen abundance in copper dinatrate Cu(NO3)2
-Please answer to the following questions: What is the price elasticity of demand? Can you explain it in your own words? What is the price elasticity of supply? Can you explain it in your own words? What is the relationship between price elasticity and position on the demand curve? For example, as you move up the demand curve to higher prices and lower quantities, what happens to the measured elasticity? How would you explain that? B-Assume that the supply of low-skilled workers is fairly elastic, but the employers’ demand for such workers is fairly inelastic. If the policy goal is to expand employment for low-skilled workers, is it better to focus on policy tools to shift the supply of unskilled labor or on tools to shift the demand for unskilled labor? What if the policy goal is to raise wages for this group? Explain your answers with supply and demand diagrams. Make sure to properly cite and reference your academic or peer-reviewed sources (minimum 2).
x(squared) -8x=0
A gas is leaking at 3.5ft3/min in a room of 2.9m by 6.9ft by 15.7m. How long would it take (in seconds) for 22% of the room to reach the LFL, if the gas has a LFL of 2.51%?
In a cheese factory, one pie costs 3800 denars. The fixed ones costs are 1,200,000 denars, and variable costs are 2,500 denars per pie. To encounter: a) income functions. profit and costs; b) the break-even point and profit and loss intervals.