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If a polynomial is divided by x - c, we can use the Remainder theorem to evaluate the polynomial at c.

The Remainder theorem:

If the polynomial f(x) is divided by x - c, then the remainder is f(c).

Example:

Given f(x) = x^3 - 4x^2 + 5x + 3, use the remainder theorem to find f(2).

Solution:

By the remainder theorem, if f(x) is divided by x - 2, then the remainder is f(2).

We can use the synthetic division to divide.

2] 1 -4 5 3

2 -4 2

__________

1 -2 1 5

The remainder is 5, so f(2) = 5

Check:

f(x) = x^3 - 4x^2 + 5x + 3

f(2) = (2)^3 - 4(2)^2 + 5(2) + 3 = 8 - 16 + 10 + 3 = 5

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Q: What do we use the polynomial remainder theorem for?
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