SOLUTION: Factor. 9x^2-5x-10

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Question 1065739: Factor.
9x^2-5x-10
Answer by Edwin McCravy(20055)   (Show Source): You can put this solution on YOUR website!
9x2-5x-10

This trinomial cannot be factored, so whenever you find
one like that in a set of problems, you simply write the 
word "prime".

How to tell if a trinomial Ax2+Bx+C is prime:

Calculate B2-4AC = (-5)2-4(9)(-10) = 25+360 = 385.
This is not a perfect square, because the square root of
385 is 19.62141687..., not a whole number.  So the trinomial 
is prime, that is, it cannot be factored. 

Edwin
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