Question 388366

how do you factor 3x^2-4x+7
<pre>
Multiply 3 by 7, getting 21

Think of all the ways to factor 21 using integers:

21 x 1 = 21
 7 x 3 = 21

Since the 7 is positive, list their sums

21 + 1 = 22
 7 + 3 = 10


Since the middle coefficient in absolute value, 4 is
not listed then the trinomial doesn't factor.  So the 
trinomial is prime.

Edwin</pre>