x2+9x+20

s2-100

t2-3t-28

36m2-121

How do you factor

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- June 21st 2009, 12:10 PMLOLFactor each of the following
x2+9x+20

s2-100

t2-3t-28

36m2-121

How do you factor - June 21st 2009, 12:24 PMskeeter
- June 21st 2009, 02:53 PMyeongil
The first and third have a leading coefficient of 1. So you know that the first terms have to be

To fill in the last terms, ask yourself, what are the factors of 20 whose sum is 9? It's +4 and +5, so fill them in:

The second and fourth are one of the special patterns that you should memorize -- these involve difference of two squares. The pattern is

a would correspond to s, and b would correspond to 10:

I'll let you try the other two.

01