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The area bounded by the curves y=x,y=x^(...

The area bounded by the curves `y=x,y=x^(3)` is

A

`(1)/(4)`

B

`(1)/(6)`

C

`(1)/(3)`

D

`(1)/(2)`

Text Solution

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The correct Answer is:
To find the area bounded by the curves \( y = x \) and \( y = x^3 \), we will follow these steps: ### Step 1: Find the Points of Intersection To find the points where the curves intersect, we set the equations equal to each other: \[ x = x^3 \] Rearranging gives: \[ x^3 - x = 0 \] Factoring out \( x \): \[ x(x^2 - 1) = 0 \] This gives us: \[ x(x - 1)(x + 1) = 0 \] Thus, the points of intersection are: \[ x = 0, \quad x = 1, \quad x = -1 \] ### Step 2: Determine the Area The area between the curves from \( x = -1 \) to \( x = 1 \) can be split into two parts: from \( x = -1 \) to \( x = 0 \) and from \( x = 0 \) to \( x = 1 \). The area \( A \) can be expressed as: \[ A = \int_{-1}^{0} (x^3 - x) \, dx + \int_{0}^{1} (x - x^3) \, dx \] ### Step 3: Calculate the First Integral Calculating the first integral: \[ \int_{-1}^{0} (x^3 - x) \, dx \] This simplifies to: \[ \int_{-1}^{0} (x^3) \, dx - \int_{-1}^{0} (x) \, dx \] Calculating each part: 1. For \( \int x^3 \, dx \): \[ \frac{x^4}{4} \bigg|_{-1}^{0} = \frac{0^4}{4} - \frac{(-1)^4}{4} = 0 - \frac{1}{4} = -\frac{1}{4} \] 2. For \( \int x \, dx \): \[ \frac{x^2}{2} \bigg|_{-1}^{0} = \frac{0^2}{2} - \frac{(-1)^2}{2} = 0 - \frac{1}{2} = -\frac{1}{2} \] Thus, the first integral becomes: \[ -\frac{1}{4} + \frac{1}{2} = -\frac{1}{4} + \frac{2}{4} = \frac{1}{4} \] ### Step 4: Calculate the Second Integral Now for the second integral: \[ \int_{0}^{1} (x - x^3) \, dx \] This simplifies to: \[ \int_{0}^{1} x \, dx - \int_{0}^{1} x^3 \, dx \] Calculating each part: 1. For \( \int x \, dx \): \[ \frac{x^2}{2} \bigg|_{0}^{1} = \frac{1^2}{2} - \frac{0^2}{2} = \frac{1}{2} \] 2. For \( \int x^3 \, dx \): \[ \frac{x^4}{4} \bigg|_{0}^{1} = \frac{1^4}{4} - \frac{0^4}{4} = \frac{1}{4} \] Thus, the second integral becomes: \[ \frac{1}{2} - \frac{1}{4} = \frac{2}{4} - \frac{1}{4} = \frac{1}{4} \] ### Step 5: Combine the Areas Now, we combine the areas from both integrals: \[ A = \frac{1}{4} + \frac{1}{4} = \frac{2}{4} = \frac{1}{2} \] ### Final Answer The area bounded by the curves \( y = x \) and \( y = x^3 \) is: \[ \boxed{\frac{1}{2}} \text{ square units} \]
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