Math  factoring
posted by Anna on .
Solve by factoring:
1.) x^2  x  12 = 0

What are the factors of 12? (6 & 2, 3 & 4)
Which combination of those will add to 1?
(x  4)(x + 3) = 0
x = 4 or 3 
First in these type of problems if there is a variable that is squared i always start by putting those in first
1) (x ) (x )
then i decide if im going to need a  or + and in this case because we want to make it  we have to put one of each
2)(x )(x+ )
then i just start by plugging in numbers and the correct answer i found was..
(x4)(x+3)
if you need help on others just post em:) 
of yes. sorry i almost forget
whenever solving for x
take the problem
(x4)(x+3)
and make each their own equation
1) (x4)=0
2)(x+3)=0
then add the 4 and the subtract the three and you get
x=4,3