Posted by Robert on Tuesday, November 20, 2012 at 11:35am.
for number one just divide by 2 first: x^2+8x+12. Then factor to get (x+2)(x+6)
for number 2 it is difference of squares so we get (x+6)(x-6)
for number three we factor: (x-5)(x-4) so x=4,5
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