1. How to Factor
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2. Example A +15 – 8 +5 – 4 Ready? Two numbers whose product is – 120
and whose sum is
+15
– 8
Ready? +5
– 4
Two numbers whose product is – 20
First one fits evenly into
Second one fits evenly into – 8

3. Example A +15 – 8 +5 – 4 3 2 Solution is and – 8 by – 4. •
We now divide by + 5,
+15
– 8
and – 8 by – 4. +5
– 4 3 2
Solution is •
(wait)

4. Example B +2 – 15 +1 – 3 Ready? Two numbers whose product is – 30
and whose sum is – 13 +2
– 15
Ready? +1
– 3
Two numbers whose product is – 3
First one fits evenly into
Second one fits evenly into – 15

5. Example B +2 – 15 +1 – 3 2 5 Solution is and – 15 by – 3. •
We now divide + 2 by + 1, +2
– 15
and – 15 by – 3. +1
– 3 2 5
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Solution is •