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Remainder Theorem Calculator

Provide the numerator and denominator polynomial, and the calculator will determine their remainder by using the remainder theorem.

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Remainder Theorem Calculator

The Remainder Theorem Calculator is a free online tool that helps you quickly find the remainder when a polynomial is divided by a linear factor. It also provides step-by-step calculations for factoring and polynomial division, making it easier to understand the process.

What Is the Remainder Theorem?

In algebra, the remainder theorem (also called little Bézout’s theorem) states that when a polynomial f(x) is divided by a linear factor of the form x - j, the remainder is equal to f(j). This theorem is a direct application of Euclidean division of polynomials and was discovered by É Bézout.

How to Find the Remainder Without a Calculator

Follow these steps to calculate the remainder by hand:

  • Take the polynomial f(x) as the dividend and the linear expression x - j as the divisor.
  • Identify the value of j from the divisor.
  • Substitute j into f(x).
  • Evaluate the polynomial at x = j to get the remainder.

Example:

Find the remainder of \(f(x) = x^4 + 12x^3 + 18x^2 - 9x + 22\) when divided by \(x - 4\).

Solution:

Step 1: Identify j from the divisor x - 4 → j = 4

Step 2: Substitute j = 4 into f(x):

\(f(4) = 4^4 + 12(4^3) + 18(4^2) - 9(4) + 22\)

\(f(4) = 256 + 768 + 288 - 36 + 22\)

\(f(4) = 1298\)

Therefore, the remainder is 1298.

How the Remainder Theorem Calculator Works

Input:

  • Enter the polynomial (dividend) in the numerator field.
  • Enter the linear divisor in the form x - j.
  • Click Calculate to find the remainder.

Output:

  • Displays the remainder of the polynomial division.
  • Shows step-by-step substitution and calculation using the remainder theorem.
  • Allows repeated calculations with the Recalculate button.

References

From Wikipedia: Polynomial Remainder Theorem – includes little Bézout’s theorem and the factor theorem.

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