Multiply the 4 by the 1, getting +4

Write down all the products of two integers which gives 4

4*1
2*2

Now out beside those write their sum, 
since -600 is negative. (If +4 had been negative
we would have found ther difference)

4*1        4+1=5
2*2        2+2=4

Notice that the absolute value of the coefficient of 
the middle term, 17, does not appear in the column of 
sums above. Therefore the trinomial does not factor.

Edwin