Tangent lines using derivatives

Grade 12 Math Worksheet - Challenge Me

NameDate

Circle the best answer, or write your answer on the line.

  1. Ari wants every x where the tangent to f(x) = x³ − 6x² is parallel to y = −9x + 2. List them, separated by commas.

  2. Bo wants every x where the tangent to f(x) = x³ − 3x² is parallel to y = 9x − 4. List them, separated by commas.

  3. Esme wants every x where the tangent to f(x) = x³ + 3x² is parallel to y = 24x + 1. List them, separated by commas.

  4. Jun wants every x where the tangent to f(x) = x³ − 9x² is parallel to y = −24x + 5. List them, separated by commas.

  5. Kira wants the line y = 6x − 1 to be tangent to f(x) = x² + c. What number c makes that happen?

  6. Luz wants the line y = 8x + 3 to be tangent to f(x) = x² + c. What number c makes that happen?

  7. Pia finds the tangent line to f(x) = sin x at x = π. Which is it?

    • y = x − π
    • y = −x + π
    • y = −x
    • y = −x − π
  8. Ren finds the tangent line to f(x) = cos x at x = π/2. Which is it?

    • y = −x − π/2
    • y = x − π/2
    • y = −x + π/2
    • y = −x
  9. Tala finds the tangent line to f(x) = ln x at x = e. Which is it?

    • y = x/e
    • y = x/e + 1
    • y = x/e + 2
    • y = x + 1 − e
  10. Zee finds the tangent line to f(x) = x ln x at x = e. Which is it?

    • y = 2x + 3e
    • y = 2x + e
    • y = ex + e − e²
    • y = 2x − e
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Tangent lines using derivatives

Answer Key - Grade 12 Math Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

  1. Ari wants every x where the tangent to f(x) = x³ − 6x² is parallel to y = −9x + 2. List them, separated by commas.

    1, 3
  2. Bo wants every x where the tangent to f(x) = x³ − 3x² is parallel to y = 9x − 4. List them, separated by commas.

    -1, 3
  3. Esme wants every x where the tangent to f(x) = x³ + 3x² is parallel to y = 24x + 1. List them, separated by commas.

    -4, 2
  4. Jun wants every x where the tangent to f(x) = x³ − 9x² is parallel to y = −24x + 5. List them, separated by commas.

    2, 4
  5. Kira wants the line y = 6x − 1 to be tangent to f(x) = x² + c. What number c makes that happen?

    8
  6. Luz wants the line y = 8x + 3 to be tangent to f(x) = x² + c. What number c makes that happen?

    19
  7. Pia finds the tangent line to f(x) = sin x at x = π. Which is it?

    • y = x − π
    • y = −x + π
    • y = −x
    • y = −x − π
  8. Ren finds the tangent line to f(x) = cos x at x = π/2. Which is it?

    • y = −x − π/2
    • y = x − π/2
    • y = −x + π/2
    • y = −x
  9. Tala finds the tangent line to f(x) = ln x at x = e. Which is it?

    • y = x/e
    • y = x/e + 1
    • y = x/e + 2
    • y = x + 1 − e
  10. Zee finds the tangent line to f(x) = x ln x at x = e. Which is it?

    • y = 2x + 3e
    • y = 2x + e
    • y = ex + e − e²
    • y = 2x − e