How to Factor (No Clicking Please)

Example A +15 – 8 +5 – 4 Ready? Two numbers whose product is – 120 and whose sum is + 7 +15 – 8 Ready? +5 – 4 Two numbers whose product is – 20 First one fits evenly into +15 Second one fits evenly into – 8

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

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 +2 Second one fits evenly into – 15

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 Thanks for watching the show Solution is •