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Finding the Remainder Using the Remainder Theorem for f(x) = x^3 + 4x + 15 Divided by x + 2

Find the remainder when the polynomial function f(x)=x3+4x+15f(x) = x^3 + 4x + 15 is divided by x+2x + 2 using the Remainder Theorem. Write the divisor x+2x + 2 in the form x−cx - c to get x−(−2)x - (-2), meaning c=−2c = -2. According to the Remainder Theorem, the remainder is equal to f(c)f(c). Evaluate the function at c=−2c = -2: f(−2)=(−2)3+4(−2)+15f(-2) = (-2)^3 + 4(-2) + 15. Simplifying this expression gives −8−8+15-8 - 8 + 15, which equals −1-1. The remainder is −1-1.

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Updated 2026-06-03

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