Find the remainder when f(x) = 4x3 - 20x - 50 is divided by x - 3.
Solution:
Here we use remainder theorem to determine the value.
The remainder theorem is stated as follows:
When a polynomial a(x) is divided by a linear polynomial b(x) whose zero is x = k, the remainder is given by r = a(k).
Given, f(x) = 4x3 - 20x - 50
The above function divided by (x - 3) implies that (x - 3) is a factor of the function.
So, x = 3
By substituting it in the equation
f(3) = 4(3)3 - 20(3) - 50
By further calculation
f(3) = 108 - 60 - 50
So we get,
f(3) = -2
Therefore, the remainder is -2.
Find the remainder when f(x) = 4x3 - 20x - 50 is divided by x - 3.
Summary:
The remainder when f(x) = 4x3 - 20x - 50 is divided by (x - 3) is -2.
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