Posted by Adriana on Thursday, June 14, 2012 at 12:26pm.
first notice that you can factor out the y, leaving
y(y^2-13y+36)
Now you want two numbers that add to -13 and multiply to 36. Obviously they must both be negative. Easy factors of 36 are
1,36 2,18 3,12 4,9
It's clear that we want 4 and 9, so our polynomial is
y(y-4)(y-9)
This factoring by inspection is mainly a skill acquired by doing a lot of problems, so you get to recognize likely factors.
Thank you soo much.. I have a lot of trouble with factoring
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