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Hi guys! I'm Nancy and today I'm going to show you

how to factor any quadratic expression.

So factoring can be a nightmare to some people because they feel like they're

just doing trial and error, stabbing in the dark

without any direction. Don't worry I have a way that doesn't involve

any guessing and will work for any quadratic expression.

First I'm going to show you a simple case and then I'm going to show you a trick

called "The Magic X"

OK. Say you have a quadratic expression like this

X squared plus 4X - 12 and you need to factor it.

What you need to find are two numbers that multiply to give you

this last number, -12, and which add to give you

the second number, positive 4.

So again, you need to find two numbers

which multiply

to -12

to positive 4.

OK.

So first think all the numbers, all the pairs of numbers that would multiply to

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