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Find the total area between the \( x \)-axis and the function on the given interval. \( f(x)=x^{3}-3 x^{2}+2 x \) \( [0,2] \) \( [?] \)

Ask by Stuart Cole. in the United States
Mar 21,2025

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The total area between the \( x \)-axis and the function \( f(x) = x^3 - 3x^2 + 2x \) on the interval \([0,2]\) is \( \frac{1}{2} \).

Solución

1. Factor the function: \[ f(x) = x^3 - 3x^2 + 2x = x(x^2 - 3x + 2) = x(x-1)(x-2) \] 2. Determine the zeros on \([0,2]\): The zeros are \( x = 0 \), \( x = 1 \), and \( x = 2 \). 3. Analyze the sign of \( f(x) \) on the intervals: - For \( x \in [0,1] \): - \( x > 0 \) - \( (x-1) < 0 \) - \( (x-2) < 0 \) Hence, \( f(x) = (+) \times (-) \times (-) > 0 \). - For \( x \in [1,2] \): - \( x > 0 \) - \( (x-1) > 0 \) - \( (x-2) < 0 \) Hence, \( f(x) = (+) \times (+) \times (-) < 0 \). 4. Set up the integral for total area: The total area \( A \) between the \( x \)-axis and \( f(x) \) is given by: \[ A = \int_{0}^{1} f(x) \, dx + \left| \int_{1}^{2} f(x) \, dx \right| \] 5. Compute the indefinite integral (antiderivative): \[ \int f(x) \, dx = \int \left( x^3 - 3x^2 + 2x \right) dx = \frac{x^4}{4} - x^3 + x^2 + C \] 6. Evaluate the integral from \( 0 \) to \( 1 \): \[ I_1 = \left[\frac{x^4}{4} - x^3 + x^2\right]_{0}^{1} = \left(\frac{1}{4} - 1 + 1\right) - \left(0\right) = \frac{1}{4} \] 7. Evaluate the integral from \( 1 \) to \( 2 \): \[ I_2 = \left[\frac{x^4}{4} - x^3 + x^2\right]_{1}^{2} \] For \( x = 2 \): \[ \frac{2^4}{4} - 2^3 + 2^2 = \frac{16}{4} - 8 + 4 = 4 - 8 + 4 = 0 \] For \( x = 1 \): \[ \frac{1}{4} - 1 + 1 = \frac{1}{4} \] Thus, \[ I_2 = 0 - \frac{1}{4} = -\frac{1}{4} \] 8. Compute the total area: \[ A = I_1 + \left| I_2 \right| = \frac{1}{4} + \frac{1}{4} = \frac{1}{2} \] Therefore, the total area between the \( x \)-axis and the function on \([0,2]\) is \( \frac{1}{2} \).

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Beyond the Answer

To find the total area between the \( x \)-axis and the function \( f(x) = x^{3}-3x^{2}+2x \) on the interval \([0,2]\), we first need to determine where the function crosses the \( x \)-axis by finding the roots of the equation \( f(x) = 0 \). Factoring, we see that \( f(x) = x(x-1)(x-2) \). The roots are \( x = 0, 1, \) and \( 2 \). Next, we need to calculate the area from \( x = 0 \) to \( x = 2 \). We'll split the interval into separate parts because the function is below the \( x \)-axis between \( x = 1 \) and \( x = 2 \): 1. From \( x = 0 \) to \( x = 1 \): The area is \( \int_0^1 (x^{3}-3x^{2}+2x) \,dx \). 2. From \( x = 1 \) to \( x = 2 \): The area is \( \int_1^2 -(x^{3}-3x^{2}+2x) \,dx \) (we take the negative since the function is below the axis). Calculating these integrals: 1. For \( \int_0^1 (x^{3}-3x^{2}+2x) \,dx \): \[ = \left[ \frac{x^{4}}{4}-x^{3}+\frac{2x^{2}}{2} \right]_0^1 = \left[ \frac{1}{4} - 1 + 1 \right] - [0] = \frac{1}{4}. \] 2. For \( \int_1^2 -(x^{3}-3x^{2}+2x) \,dx \): \[ = -\left[ \frac{x^{4}}{4}-x^{3}+\frac{2x^{2}}{2} \right]_1^2 = -\left[ \left( \frac{16}{4} - 8 + 8 \right) - \left( \frac{1}{4} - 1 + 1 \right) \right] = -\left[ 4 - \frac{1}{4} \right] = -\left[ \frac{16}{4} - \frac{1}{4} \right] = -\frac{15}{4}. \] The total area is then: \[ \text{Total Area} = \frac{1}{4} + \frac{15}{4} = \frac{16}{4} = 4. \] Thus, the total area between the \( x \)-axis and the function \( f(x) \) on the interval \([0, 2]\) is \( 4 \).

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