Learn Before
Example

Finding the Remainder Using the Remainder Theorem for f(x) = x^3 - 7x + 12 Divided by x + 3

Find the remainder when the polynomial function f(x)=x3−7x+12f(x) = x^3 - 7x + 12 is divided by x+3x + 3 using the Remainder Theorem. Rewrite the divisor x+3x + 3 in the form x−cx - c to find that x−(−3)x - (-3), so c=−3c = -3. By the Remainder Theorem, the remainder is f(c)f(c). Evaluate the function at c=−3c = -3: f(−3)=(−3)3−7(−3)+12f(-3) = (-3)^3 - 7(-3) + 12. Simplifying this gives −27+21+12-27 + 21 + 12, which equals 66. The remainder is 66.

0

1

Updated 2026-06-18

Contributors are:

Who are from:

Tags

OpenStax

Intermediate Algebra @ OpenStax

Ch.5 Polynomials and Polynomial Functions - Intermediate Algebra @ OpenStax

Algebra

Related
Learn After