Posted by rick on Tuesday, March 20, 2012 at 1:42am.
A) You know it will be one of
(5s+a)(3s+b)
(15s+a)(s+b)
where a*b = 8
Looks like 15,1 won't work, so
(3s+4)(5s+2)
wolframalpha will do polynomial factorization, but the only way you'll be ready for a test is to do lots of these. It's just trial and error until you have enough practice to factor by inspection.
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