Factoring Trinomials | MathHelp.com - By MathHelp.com
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| 00:00 | just like the problems we've been doing this . Try | |
| 00:03 | no meal has an X . Squared term , an | |
| 00:06 | X term and a constant term . So it can | |
| 00:09 | be factored as the product of two by no meals | |
| 00:13 | . We set up our two sets of parentheses . | |
| 00:17 | Uh huh . X square breaks down into X times | |
| 00:22 | X . And what we're looking for are the factors | |
| 00:26 | of -15 that add to positive too . The difference | |
| 00:32 | between this problem and the ones in the previous section | |
| 00:36 | is that the constant term is negative . A negative | |
| 00:40 | number of factors into the product of a positive and | |
| 00:44 | a negative . So this negative 15 can be thought | |
| 00:48 | of as positive 15 times negative one -15 times positive | |
| 00:57 | one positive five times negative three or negative five times | |
| 01:04 | positive three . So which pair of these factors adds | |
| 01:09 | to positive too positive five and negative three . So | |
| 01:17 | our answer is X-plus five X minus three . |
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