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chen74304's Question
Math
Posted 5 months ago
why
Determine the area under the curve y=4x2y = 4 - x^2 from x=2x = -2 to x=2x = 2.
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Answer from Sia
Posted 5 months ago
Solution by Steps
step 1
We need to find the area under the curve y=4x2y = 4 - x^2 from x=2x = -2 to x=2x = 2. This requires evaluating the definite integral 22(4x2)dx\int_{-2}^{2} (4 - x^2) \, dx
step 2
First, we find the antiderivative of the integrand 4x24 - x^2. The antiderivative is 4xx33+C4x - \frac{x^3}{3} + C
step 3
Next, we evaluate this antiderivative at the bounds x=2x = -2 and x=2x = 2
step 4
Evaluating at x=2x = 2: 4(2)(2)33=883=883=24383=1634(2) - \frac{(2)^3}{3} = 8 - \frac{8}{3} = 8 - \frac{8}{3} = \frac{24}{3} - \frac{8}{3} = \frac{16}{3}
step 5
Evaluating at x=2x = -2: 4(2)(2)33=883=8+83=243+83=1634(-2) - \frac{(-2)^3}{3} = -8 - \frac{-8}{3} = -8 + \frac{8}{3} = -\frac{24}{3} + \frac{8}{3} = -\frac{16}{3}
step 6
Subtract the value at x=2x = -2 from the value at x=2x = 2: 163(163)=163+163=323\frac{16}{3} - (-\frac{16}{3}) = \frac{16}{3} + \frac{16}{3} = \frac{32}{3}
step 7
Therefore, the area under the curve y=4x2y = 4 - x^2 from x=2x = -2 to x=2x = 2 is 32310.667\frac{32}{3} \approx 10.667
Answer
The area under the curve is 32310.667\frac{32}{3} \approx 10.667.
Key Concept
Definite Integral
Explanation
The definite integral of a function over an interval gives the area under the curve of that function over that interval.

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