Using the remainder theorem, find the remainder when f(x) is divided by g(x) and verify the by actual division
Question:
Using the remainder theorem, find the remainder when f(x) is divided by g(x) and verify the by actual division
$f(x)=4 x^{3}-12 x^{2}+14 x-3, g(x)=2 x-1$
Solution:
Here, $f(x)=4 x^{3}-12 x^{2}+14 x-3$
g(x) = 2x - 1
from, the remainder theorem when f(x) is divided by g(x) = 2(x - 1/2), the remainder is equal to f(1/2)
Let, g(x) = 0
⟹ 2x - 1 = 0
⟹ 2x = 1
⟹ x = 1/2
Substitute the value of x in f(x)
$f(1 / 2)=4(1 / 2)^{3}-12(1 / 2)^{2}+14(1 / 2)-3$
= 4(1/8) - 12(1/4) + 4(1/2) - 3
= (1/2) - 3 + 7 - 3
= (1/2) + 1
Taking L.C.M
$=\left(\frac{2+1}{2}\right)$
= (3/2)
Therefore, the remainder is (3/2)