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Section 5.4 Derivatives

Find the derivative \(f'(x)\) for each function. Choose the correct answer.

Subsection 5.4.1 Differentiation

Checkpoint 5.4.1.

Checkpoint 5.4.2.

Checkpoint 5.4.3.

\(f(x) = \frac{5x^2 - 3}{x + 2}\text{.}\) Find \(f'(x)\) using the Quotient Rule.
  • \(\frac{10x(x + 2) - (5x^2 - 3)(1)}{(x + 2)^2}\)
  • \(\frac{10x(x + 2) + (5x^2 - 3)(1)}{(x + 2)^2}\)
  • \(\frac{10x}{1}\)
  • \(\frac{5x^2 - 3}{(x + 2)^2}\)

Checkpoint 5.4.4.

Checkpoint 5.4.5.

Checkpoint 5.4.6.

Checkpoint 5.4.7.

Checkpoint 5.4.8.

Checkpoint 5.4.9.

\(f(x) = \ln\left(\frac{3x + 1}{x - 2}\right)\text{.}\) Find \(f'(x)\) by using log properties first.
  • \(\frac{3}{3x + 1} - \frac{1}{x - 2}\)
  • \(\frac{3}{3x + 1} + \frac{1}{x - 2}\)
  • \(\frac{1}{\frac{3x + 1}{x - 2}}\)
  • \(\frac{x - 2}{3x + 1}\)

Checkpoint 5.4.10.

\(f(x) = \log_5(x^2 - 3)\text{.}\) Find \(f'(x)\) using the change-of-base rule.
  • \(\frac{2x}{x^2 - 3}\)
  • \(\frac{2x}{(x^2 - 3) \cdot \ln 5}\)
  • \(\frac{1}{(x^2 - 3) \cdot \ln 5}\)
  • \(\frac{2x \cdot \ln 5}{x^2 - 3}\)

Checkpoint 5.4.11.

Checkpoint 5.4.12.

\(f(x) = e^{x^2} \cdot x\text{.}\) Find \(f'(x)\) using the Product Rule.

Checkpoint 5.4.13.

Checkpoint 5.4.14.

Checkpoint 5.4.15.

Checkpoint 5.4.16.

Checkpoint 5.4.17.

Checkpoint 5.4.18.

Checkpoint 5.4.19.

Checkpoint 5.4.20.

\(f(x) = \frac{x^2 \cdot e^x}{\sin(x)}\text{.}\) Find \(f'(x)\) using Quotient and Product Rules.
  • \(\frac{(2xe^x + x^2e^x)\sin(x) - (x^2e^x)\cos(x)}{\sin^2(x)}\)
  • \(\frac{(2xe^x + x^2e^x) - \cos(x)}{\sin^2(x)}\)
  • \(\frac{x^2e^x \cos(x)}{\sin^2(x)}\)
  • \(\frac{2xe^x}{\cos(x)}\)

Subsection 5.4.2 Implicit Differentiation

Find \(\frac{dy}{dx}\) using implicit differentiation for each equation. Choose the correct answer.

Checkpoint 5.4.21.

Checkpoint 5.4.22.

Checkpoint 5.4.23.

Checkpoint 5.4.24.

Checkpoint 5.4.25.

Checkpoint 5.4.26.

Checkpoint 5.4.27.

Checkpoint 5.4.28.

Checkpoint 5.4.29.

Checkpoint 5.4.30.

Subsection 5.4.3 Tangent and Normal Lines

Find the slope or equation of tangent and normal lines for the given curves.

Checkpoint 5.4.31.

Checkpoint 5.4.32.

Checkpoint 5.4.33.

Checkpoint 5.4.34.

Checkpoint 5.4.35.

Checkpoint 5.4.36.

Checkpoint 5.4.37.

Checkpoint 5.4.38.

Checkpoint 5.4.39.

The curve \(y = ax^2 + bx\) has a tangent line with slope of 5 at the point (1, 3). Find the values of \(a\) and \(b\text{.}\)

Checkpoint 5.4.40.

Find the \(x\)-coordinate(s) on the curve \(y = \frac{1}{3}x^3 - 2x^2 + 3x\) where the tangent line is parallel to the x-axis.

Checkpoint 5.4.41.

Checkpoint 5.4.42.

Checkpoint 5.4.43.

Checkpoint 5.4.44.

Checkpoint 5.4.45.

Checkpoint 5.4.46.

Checkpoint 5.4.47.

Checkpoint 5.4.48.

Checkpoint 5.4.49.

Checkpoint 5.4.50.