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Common Core Standard HSN-CN.C.9 Questions

(+) Know the Fundamental Theorem of Algebra; show that it is true for quadratic polynomials.

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Grade 11 Polynomials and Rational Expressions CCSS: HSN-CN.C.9
Jeremy is working with the Fundamental Theorem of Algebra, and thinks he's found an exception. Looking at f(x)=4(x-1)2, this will result in only one root, x=1. Therefore, despite this being a second degree polynomial, there is only one root. Is this correct?
  1. Yes, this is a known exception.
  2. No, this is not a polynomial, it is a quadratic function.
  3. No, if the quadratic formula is used, the other root is found.
  4. No, this root has multiplicity of 2, which means it counts as two roots.
Grade 11 Polynomials and Rational Expressions CCSS: HSN-CN.C.9
Looking at the graph of a quadratic polynomial, roots or zeros correspond to where the graph crosses the x-axis. When the graph just touches the x-axis, this corresponds to a double root. The Fundamental Theorem of Algebra states that a quadratic polynomial will always have 2 roots. How is this reconciled with a quadratic polynomial whose graph does not intersect the x-axis?
  1. Quadratic polynomials always intersect the x-axis.
  2. If a quadratic polynomial doesn't cross the x-axis it is no longer a polynomial, and the Fundamental Theorem of Algebra no longer applies.
  3. When a quadratic polynomial doesn't cross the x-axis, this simply implies that its roots are complex with non-zero imaginary parts.
  4. Simply translate the quadratic polynomial till it does cross the x-axis.
Grade 12 Polynomials and Rational Expressions CCSS: HSN-CN.C.9
How many roots does the polynomial x2-6-x4-x6 have?
  1. 6
  2. 5
  3. 2
  4. 1
Grade 12 Polynomials and Rational Expressions CCSS: HSN-CN.C.9
How many roots does the polynomial x3-x6-x-x7 have?
  1. 6
  2. 3
  3. 7
  4. 1

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