Try It Yourself#

Exercise 1#

Compute

\[\displaystyle \int 2e ~dy.\]

Verify your answer by computing its derivative.

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Answer: \(2ey + C\)

Exercise 2#

Compute

\[\int 3 x^{5/4} + \frac{7}{\sqrt{x}}+ \frac{1}{6x^5} ~dx.\]

Verify your answer by computing its derivative.

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Answer: \(\frac{4}{3}x^{9/4} + 14\sqrt{x} - \frac{1}{24x^4} + C\)

Exercise 3#

Compute

\[\int (e^{3x} + 4)(e^{-5x} - 20) ~dx.\]

Verify your answer by computing its derivative.

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Answer: \(-\frac{1}{2}e^{-2x} - \frac{20}{3}e^{3x} - \frac{4}{5}e^{-5x} - 80x + C\)

Exercise 4#

Compute

\(\int \frac{10x^3 - 2x^2 + 3x-25 }{x} ~dx.\)$

Verify your answer by computing its derivative.

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Answer: \(\frac{10}{3}x^3 - x^2 + 3x - 25\ln|x| + C\)

Exercise 5#

Find \(f(x)\) such that

\[ f'(x) = e^{7x} + 2x^3 +3 \quad \text{ and } \quad f(0)=2.\]

Verify your answer by computing its derivative.

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Answer: \(\frac{1}{7}e^{7x} + \frac{1}{2}x^4 + 3x + \frac{13}{7}\)

Exercise 6#

The marginal cost function associated with producing \(x\) croissants is given by

\[C'(x) = -0.5x +60 \]

where \(C'(x)\) is measured in dollars/unit and \(x\) denotes the number of croissants.

If the daily fixed costs incurred in the production is \(\$400\), find the total cost \(C(x)\) incurred in producing the first 100 units of the day.

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Answer: $3900

Exercise 7#

Compute

\[\int \frac{5x-3}{(5x^2-6x+15)^4} ~dx.\]

Verify your answer by computing its derivative.

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Answer: \(-\frac{1}{6(5x^2 - 6x + 15)^3} + C\)

Exercise 8#

Compute

\[\int \frac{x}{x-2} ~dx.\]

Verify your answer by computing its derivative.

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Answer: \(x + 2\ln|x-2| + C\)

Exercise 9#

Compute

\[\int \frac{e^{3x}}{e^{3x}-4} ~dx.\]

Verify your answer by computing its derivative.

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Answer: \(\frac{1}{3}\ln|e^{3x}-4| + C\)

Exercise 10#

Find \(f(x)\) such that

\[f'(x) = (5x+1)(5x^2+2x-1)^2 \quad \text{ and } \quad f(1) = 15.\]

Verify your answer by computing its derivative.

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Answer: \(\frac{1}{6}(5x^2+2x-1)^3 - 21\)

Exercise 11#

Compute

\[\int 3x ~\sqrt[]{x^2+10} ~dx.\]

Verify your answer by computing its derivative.

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Answer: \((x^2+10)^{3/2} + C\)

Exercise 12#

Compute

\[\int 15x^3 ~\sqrt[]{x^2+10} ~dx.\]

Verify your answer by computing its derivative.

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Answer: \(3(x^2+10)^{5/2} - 50(x^2+10)^{3/2} + C\)