# Remainder theorem

##### Examples

###### Lessons

**Understanding the remainder Theorem**

Prove the Remainder Theorem

**Finding the Remainder Using Synthetic Division and the Remainder Theorem**

Find the remainder when $\left( {4{x^3} - 7x + 10} \right)$ is divided by $\left( {2x - 5} \right)$- When $\left( {8{x^3} + a{x^2} + bx - 1} \right)$ is divided by:

i) $\left( {2x - 5} \right)$, the remainder is $54$

ii) $\left( {x + 1} \right)$, the remainder is $- 30$

Find the values of $a$ and $b$.

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###### Topic Notes

You may want to refresh your memory on polynomial long division and synthetic division to better understand this lesson. The remainder theorem simply states that if a polynomial f(x) is divided by a linear expression x-r, the value of f(r) is equal to the remainder.

$\cdot$ When a polynomial, $P(x)$, is divided by $(x-a)$: Remainder $=P(a)$

$\cdot$ When a polynomial, $P(x)$, is divided by $(ax-b)$: Remainder $=P(\frac{b}{a})$

$\cdot$ When a polynomial, $P(x)$, is divided by $(ax-b)$: Remainder $=P(\frac{b}{a})$

###### Basic Concepts

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