Math Problem Statement

For the following polynomial​ function, use the remainder theorem to find​ f(k).

f left parenthesis x right parenthesis equals 2 x Superscript 5 Baseline minus 8 x cubed minus 13 x squared minus 25f(x)=2x5−8x3−13x2−25​;

kequals=33

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Part 1

​f(33​)equals=enter your response here

​(Simplify your​ answer.)

Solution

To find f(33)f(33) for the polynomial f(x)=2x58x313x225f(x) = 2x^5 - 8x^3 - 13x^2 - 25 using the Remainder Theorem, we proceed as follows:

  1. Apply the Remainder Theorem: According to the Remainder Theorem, f(k)f(k) is equal to the remainder when f(x)f(x) is divided by xkx - k.

    In this case, we need to calculate f(33)f(33), which means we will substitute x=33x = 33 directly into f(x)f(x).

  2. Substitute x=33x = 33 in f(x)f(x): f(33)=2(33)58(33)313(33)225f(33) = 2(33)^5 - 8(33)^3 - 13(33)^2 - 25

  3. Calculate each term individually:

    • 335=3913539333^5 = 39135393
    • 333=3593733^3 = 35937
    • 332=108933^2 = 1089

    Now substitute these values into the expression:

    f(33)=2(39135393)8(35937)13(1089)25f(33) = 2(39135393) - 8(35937) - 13(1089) - 25

  4. Simplify each part:

    • 2×39135393=782707862 \times 39135393 = 78270786
    • 8×35937=2874968 \times 35937 = 287496
    • 13×1089=1415713 \times 1089 = 14157
  5. Combine all terms: f(33)=782707862874961415725f(33) = 78270786 - 287496 - 14157 - 25

  6. Final Calculation: f(33)=77949108f(33) = 77949108

Therefore, f(33)=77949108f(33) = 77949108.

Would you like more details on this process? Here are some related questions:

  1. How does the Remainder Theorem help with polynomial evaluations?
  2. What steps would be needed if we used synthetic division?
  3. How does the result change with different values of kk?
  4. Can we estimate large polynomial expressions without expanding fully?
  5. Why are terms with zero coefficients omitted in polynomials?

Tip: For higher powers of polynomials, breaking down the calculations into smaller steps can reduce errors.

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Math Problem Analysis

Mathematical Concepts

Polynomial Functions
Remainder Theorem
Exponentiation

Formulas

f(k) = Remainder when f(x) is divided by x - k

Theorems

Remainder Theorem

Suitable Grade Level

Grades 11-12