Introduction to Factoring

# Introduction to Factoring | The Complete SAT Course - Class 10 PDF Download

## Factoring

To factor means to write as a product (that is, a multiplication). All of the terms in a product are called factors (divisors) of the product.
Example:

There are many ways to factor
Therefore, 1, 2, 3, 4, 6, and 12 are the factors of 12.

Example:

Two bells, A and B, ring simultaneously, then bell A rings every 168 seconds and bell B rings every 360 seconds. What is the minimum number of seconds between simultaneous rings?
This question is asking for the least common multiple of 168 and 360. The prime factorization of 168 is 2 x 2 x 2 x 3 x 7 and the prime factorization of 360 is 2 x 2 x 2 x 3 x 3 x 5. A common multiple must have all of the factors that each of these numbers has, and the smallest of these is 2 x 2 x 2 x 3 x 3 x 5 x 7. So they ring together every 2,520 seconds.

## The Law of FOIL

### Factoring Formulas

To factor polynomials, it often helps to know some common factoring formulas:

Example:

Factor x2 - 36.
This is a “difference of squares”: x2 - 36 = (x - 6)(x + 6).
Factor x2 - 5x - 14
This is a simple trinomial. Look for two numbers that have a sum of –5 and a product of –14. With a little guessing and checking, you will see that –7 and 2 work. So x2 - 5x - 14 = (x - 7)(x + 2).

## The Zero Product Property

Factoring is a great tool for solving equations if it”s used with the zero product property, which says that if the product of a set of numbers is 0, then at least one of the numbers in the set must be 0.
Example:

Solve x2 - 5x - 14 = 0 .
Factor: (x - 7)(x + 2)
Since their product is 0, either  x - 7 = 0 or x + 2 = 0 , so  x = 7 or –2.

The only product property is the zero product property.

Factoring is the process of breaking down a mathematical expression into its factors, which are individual parts that can be multiplied together to get the original expression. Factoring is often used in algebra to simplify expressions and solve equations.

For example:

Consider the expression x2 + 5x + 6. This expression can be factored into (x + 2)(x + 3), where (x + 2) and (x + 3) are the factors. To check if this is correct, we can use the distributive property of multiplication and see that:
(x + 2)(x + 3) = x(x + 3) + 2(x + 3) = x^2 + 3x + 2x + 6 = x2 + 5x + 6
Factoring can also be used to solve equations, by setting the expression equal to zero and then factoring to find the values of x that make the expression equal zero. For example, consider the equation x2 + 5x + 6 = 0. We can factor the left side of the equation as (x + 2)(x + 3) = 0, and then use the zero product property to find that x = -2 or x = -3 are the solutions to the equation.

The document Introduction to Factoring | The Complete SAT Course - Class 10 is a part of the Class 10 Course The Complete SAT Course.
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## The Complete SAT Course

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## The Complete SAT Course

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