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September 21, 2014

September 21, 2014

Posted by **Autumn** on Thursday, May 15, 2008 at 10:01pm.

Example:

x²-2x=8

- algebra -
**Quidditch**, Thursday, May 15, 2008 at 10:21pmX^2 -2X = 8

In "set to zero" form:

X^2 - 2X - 8 = 0

factoring:

(X + ?) * (X + ?) = 0

The two different numbers that are question marks must equal 8 when multiplying them together. This would suggest trying:

1, 8

or 2, 4

Since 8 is negative, one of the values must be negative.

The first factor is:

(X - 4)

So...

(X - 4) * (X + ?)

You can get the second factor easily from that.

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