# What is the standard form of # y=(x - 8) (x + 10) #?

##### 1 Answer

Jul 23, 2016

Check out the explanation.

#### Explanation:

I would highly recommend using the FOIL method, a mnemonic device that I was taught in my Algebra class. It's simple and very easy to learn and memorize.

So first, let's start off with the equation:

Using the FOIL method, I will:

- Multiply the
#x# in the first set of parenthesis by the#x# in the second set of parenthesis

- Multiply the
#x# in the first set of parenthesis by the#10# in the second set of parenthesis

- Multiply the
#-8# in the first set of parenthesis by the#x# in the second set of parenthesis

- Multiply the
#-8# in the first set of parenthesis by the#10# in the second set of parenthesis.

Now let's combine them all together into one equation:

And let's simplify that equation by combining like terms (in this case it's the two numbers that share

#y=x^2+2x-80#

And there's your answer!

Edit: and here's a picture of the FOIL method.