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What is remainder theorem?
Remainder theorem:
The remainder theorem states that when a polynomial, $p(x)$ is divided by a linear polynomial, $x - a$ the remainder of that division will be equivalent to $p(a)$.
For example,
$f(x) = x^3 + x^2 + x+1$
$g(x) = x -\frac{1}{2}$
So, the remainder will be $f(\frac{1}{2})$.
$f(\frac{1}{2}) = (\frac{1}{2})^3+(\frac{1}{2})^2+(\frac{1}{2}) + 1$
$= \frac{1}{8} + \frac{1}{4} + \frac{1}{2}+1$
$=\frac{1+1\times2+1\times4+1\times8}{8}$ (LCM of 1, 2, 4 and 8 is 8)
$=\frac{1+2+4+8}{8}$
$=\frac{15}{8}$
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