Question 110214
Use the "ac" test to determine if the following trinomial can be factored.
x^2+2x+3 
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Your Problem:
a = 1 ; b = 2 ; c = 3
Think of two numbers whose product is a*c = 1*3 = 3 
and whose sum is b = 2
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There are no such numbers.
The ac method cannot be used to factor your problem.
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Cheers,
Stan H.