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Let 
f(x)=x-4 and

g(x)=(x-4)^(3)". "
Find the sum of the areas enclosed by the graphs of 
f and 
g between 
x=3 and 
x=5.
Use a graphing calculator and round your answer to three decimal places.

Let f(x)=x4 f(x)=x-4 and g(x)=(x4)3 g(x)=(x-4)^{3} \text {. } \newlineFind the sum of the areas enclosed by the graphs of f f and g g between x=3 x=3 and x=5 x=5 .\newlineUse a graphing calculator and round your answer to three decimal places.

Full solution

Q. Let f(x)=x4 f(x)=x-4 and g(x)=(x4)3 g(x)=(x-4)^{3} \text {. } \newlineFind the sum of the areas enclosed by the graphs of f f and g g between x=3 x=3 and x=5 x=5 .\newlineUse a graphing calculator and round your answer to three decimal places.
  1. Understand the Problem: First, we need to understand the problem. We are asked to find the sum of the areas between two curves, f(x)f(x) and g(x)g(x), from x=3x = 3 to x=5x = 5. To do this, we will calculate the definite integral of the absolute value of the difference between the two functions over the interval [3,5][3, 5].
  2. Set Up Integral: Let's set up the integral to find the area between the two curves. The area AA can be found by integrating the absolute value of the difference between f(x)f(x) and g(x)g(x) from x=3x = 3 to x=5x = 5:\newlineA=35f(x)g(x)dxA = \int_{3}^{5} |f(x) - g(x)| \, dx
  3. Determine Top Function: We need to determine the function that is on top (greater yy-value) over the interval [3,5][3, 5]. Since f(x)f(x) is a linear function and g(x)g(x) is a cubic function with the same root at x=4x = 4, we can expect g(x)g(x) to be below f(x)f(x) near the root. However, we should verify this by evaluating the functions at a point in the interval, such as x=3.5x = 3.5.\newlinef(3.5)=3.54=0.5f(3.5) = 3.5 - 4 = -0.5\newlineg(3.5)=(3.54)3=0.53=0.125g(3.5) = (3.5 - 4)^3 = -0.5^3 = -0.125\newlineSince [3,5][3, 5]00, f(x)f(x) is above g(x)g(x) in the interval [3,5][3, 5].
  4. Write Integral: Now we can write the integral without the absolute value, as we know f(x)f(x) is above g(x)g(x):\newlineA=35(f(x)g(x))dxA = \int_{3}^{5} (f(x) - g(x)) \, dx\newlineA=35((x4)(x4)3)dxA = \int_{3}^{5} ((x - 4) - (x - 4)^3) \, dx
  5. Calculate Integral: Let's calculate the integral:\newlineA=35(x4(x4)3)dxA = \int_{3}^{5} (x - 4 - (x - 4)^3) \, dx\newlineA=[12x24x14x4+4x316x2+64x64]35A = [\frac{1}{2}x^2 - 4x - \frac{1}{4}x^4 + 4x^3 - 16x^2 + 64x - 64]_{3}^{5}\newlineNow we need to evaluate this antiderivative at the bounds x=5x = 5 and x=3x = 3 and subtract the results.
  6. Evaluate at x=5x=5: Evaluating the antiderivative at x=5x = 5:

    A(5)=0.5(5)24(5)14(5)4+4(5)316(5)2+64(5)64A(5) = 0.5(5)^2 - 4(5) - \frac{1}{4}(5)^4 + 4(5)^3 - 16(5)^2 + 64(5) - 64
    A(5)=0.5(25)2014(625)+4(125)16(25)+32064A(5) = 0.5(25) - 20 - \frac{1}{4}(625) + 4(125) - 16(25) + 320 - 64
    A(5)=12.520156.25+500400+32064A(5) = 12.5 - 20 - 156.25 + 500 - 400 + 320 - 64
    A(5)=12.520156.25+500400+32064A(5) = 12.5 - 20 - 156.25 + 500 - 400 + 320 - 64
    A(5)=142.5A(5) = 142.5

    Evaluating the antiderivative at x=3x = 3:

    A(3)=0.5(3)24(3)14(3)4+4(3)316(3)2+64(3)64A(3) = 0.5(3)^2 - 4(3) - \frac{1}{4}(3)^4 + 4(3)^3 - 16(3)^2 + 64(3) - 64
    A(3)=0.5(9)1214(81)+4(27)16(9)+19264A(3) = 0.5(9) - 12 - \frac{1}{4}(81) + 4(27) - 16(9) + 192 - 64
    x=5x = 500
    x=5x = 500
    x=5x = 522

    Now we subtract x=5x = 533 from x=5x = 544 to find the area:

    x=5x = 555
    x=5x = 566
    x=5x = 577

    However, this calculation is incorrect because the antiderivative was not computed correctly. There is a math error in the antiderivative expression and its evaluation.

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