section+9.3+-+factoring+trinomials+(part+1)

=__Notes on 9.3 factoring trinomials (part 1)__=

ex) x^2+5x+6 __6__
1,6

2,3...2+3= 5 and 2(3)=6
Answer: (x+2)(x+3)

WHEN NEGATIVE...

ex) x^2-7x-30 __30__
1,30 2,15

3,10...you must change 10 to -10 and keep 3 as +3. 3-10=-7 and 3(10)=30
5,6 Answer: (x-10)(x+3)

WHEN NEGATIVE AND POSITIVE...

ex) x^2-13x+40 __40__
1,40 2,20 4,10

5,8...except this time both 5 and 8 and negative making a sum of -13.
Answer: (x-5)(x-8)