<PRE><B>Question 738087</B>
Keep on using what you have been learning.  What two numbers, integers, have product -100 and have sum +21?


Pick possibilities using the product 100.
10 and 10
5 and 20
4 and 25
2 and 50

One of the parts of the combination will need (most likely) to be negative and the other positive.


Look at 4 and 25.  ONE of them must be positive and THE OTHER must be negative; but which?  
-4+25= what?
4+(-25)=what?
(x_______)*(x_______)=x^2+21x-100</PRE>