Polynomials and rational functions

Practice sheet

Fresh questions from the whole chapter, to do on paper.

To save a PDF, choose “Save as PDF” in the print dialog.

  1. Expand (x+6)(x+9)(x + 6)(x + 9). What is the coefficient of xx?
  2. What is the constant term of (x+9)(x2+1x+6)(x + 9)(x^2 + 1x + 6)?
  3. A polynomial of degree 5 is multiplied by a polynomial of degree 5. What is the degree of the product?
  4. Describe the end behavior of f(x)=7x3f(x) = 7x^{ 3 }.
    1. As x→∞x \to \infty, f(x)→∞f(x) \to \infty; as x→−∞x \to -\infty, f(x)→−∞f(x) \to -\infty
    2. As x→±∞x \to \pm\infty, f(x)→∞f(x) \to \infty
    3. As x→∞x \to \infty, f(x)→−∞f(x) \to -\infty; as x→−∞x \to -\infty, f(x)→∞f(x) \to \infty
  5. Describe the end behavior of f(x)=−9x6f(x) = -9x^{ 6 }.
    1. As x→±∞x \to \pm\infty, f(x)→−∞f(x) \to -\infty
    2. As x→±∞x \to \pm\infty, f(x)→∞f(x) \to \infty
    3. As x→∞x \to \infty, f(x)→−∞f(x) \to -\infty; as x→−∞x \to -\infty, f(x)→∞f(x) \to \infty
  6. p(x)=7x2−9x5+9p(x) = 7x^2 - 9x^5 + 9. What is the leading coefficient of pp?
  7. Find all the zeros of p(x)=(x−4)(x+2)2p(x) = (x - 4)(x + 2)^2.
  8. p(x)=(x−4)2(x+9)p(x) = (x - 4)^2(x + 9). What does the graph of pp do at x=4x = 4?
    1. It touches the x-axis and turns back
    2. It crosses the x-axis
    3. It does not reach the x-axis
  9. Divide: x2+13x+42x+6\dfrac{x^2 + 13x + 42}{x + 6}. Enter the quotient.
  10. Divide x3−1x^3 - 1 by x−1x - 1. Enter the quotient.
  11. Find the remainder when x2+4x+1x^2 + 4x + 1 is divided by x−4x - 4.
  12. What is the remainder when p(x)=x3−5x+7p(x) = x^3 - 5x + 7 is divided by x−3x - 3?