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What is the area of the region between the graphs of 
f(x)=sqrt(x+10) and 
g(x)=x-2 from 
x=-10 to 
x=6 ?
Choose 1 answer:
(A) 
(64)/(3)
(B) 160
(C) 
(320)/(3)
(D) 128

What is the area of the region between the graphs of f(x)=x+10 f(x)=\sqrt{x+10} and g(x)=x2 g(x)=x-2 from x=10 x=-10 to x=6 x=6 ?\newlineChoose 11 answer:\newline(A) 643 \frac{64}{3} \newline(B) 160160\newline(C) 3203 \frac{320}{3} \newline(D) 128128

Full solution

Q. What is the area of the region between the graphs of f(x)=x+10 f(x)=\sqrt{x+10} and g(x)=x2 g(x)=x-2 from x=10 x=-10 to x=6 x=6 ?\newlineChoose 11 answer:\newline(A) 643 \frac{64}{3} \newline(B) 160160\newline(C) 3203 \frac{320}{3} \newline(D) 128128
  1. Set up integral bounds: To find the area between the two curves, we need to set up an integral from the lower bound of x=10x = -10 to the upper bound of x=6x = 6. The area AA can be found by integrating the difference between the two functions over this interval.
  2. Determine function order: First, we need to determine which function is above the other in the interval from x=10x = -10 to x=6x = 6. Since f(x)=x+10f(x) = \sqrt{x+10} is always positive or zero and g(x)=x2g(x) = x-2 can be negative or positive, we can conclude that f(x)f(x) is above g(x)g(x) for the entire interval.
  3. Calculate integral: The area AA between the two curves is given by the integral from 10-10 to 66 of (f(x)g(x))dx(f(x) - g(x)) \, dx, which is the integral from 10-10 to 66 of (x+10(x2))dx(\sqrt{x+10} - (x-2)) \, dx.
  4. Integrate x+10\sqrt{x+10}: Now we calculate the integral:\newlineA=106(x+10(x2))dxA = \int_{-10}^{6} (\sqrt{x+10} - (x-2)) \, dx\newlineThis requires us to integrate term by term.
  5. Integrate x2x-2: First, we integrate x+10\sqrt{x+10} with respect to xx from 10-10 to 66. The antiderivative of x+10\sqrt{x+10} is 23\frac{2}{3}(x+10)32(x+10)^{\frac{3}{2}}.
  6. Evaluate antiderivatives: Next, we integrate (x2)(x-2) with respect to xx from 10-10 to 66. The antiderivative of (x2)(x-2) is (1/2)x22x(1/2)\cdot x^2 - 2x.
  7. Evaluate x+10\sqrt{x+10}: Now we evaluate the antiderivatives at the bounds x=6x = 6 and x=10x = -10 and subtract the lower bound from the upper bound for each term.\newlineFor x+10\sqrt{x+10}, we have [23(6+10)32][23(10+10)32]\left[\frac{2}{3}\cdot(6+10)^{\frac{3}{2}}\right] - \left[\frac{2}{3}\cdot(-10+10)^{\frac{3}{2}}\right].\newlineFor (x2)(x-2), we have [126226][12(10)22(10)]\left[\frac{1}{2}\cdot6^2 - 2\cdot6\right] - \left[\frac{1}{2}\cdot(-10)^2 - 2\cdot(-10)\right].
  8. Evaluate (x2)(x-2): Evaluating the antiderivatives, we get:\newlineFor x+10\sqrt{x+10}, (23)(16)32\left(\frac{2}{3}\right)\cdot\left(16\right)^{\frac{3}{2}} - (23)(0)32\left(\frac{2}{3}\right)\cdot\left(0\right)^{\frac{3}{2}} = 23\frac{2}{3}\cdot6464 - 00 = 1283\frac{128}{3}.\newlineFor (x2)(x-2), (12)3612\left(\frac{1}{2}\right)\cdot36 - 12 - (12)100+20\left(\frac{1}{2}\right)\cdot100 + 20 = 1818 - 1212 - 5050 - 2020 = 64-64.
  9. Add antiderivatives: Now we add the results of the two antiderivatives to find the total area: A=1283(64)=1283+1923=3203A = \frac{128}{3} - (-64) = \frac{128}{3} + \frac{192}{3} = \frac{320}{3}.
  10. Final answer: The final answer is (320/3)(320/3), which corresponds to answer choice (C)(C).

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