Posted by wmietlin@elp.rr.com (67.10.110.29) on July 11, 2003 at 11:23:57:

In Reply to: factoring a trinomial posted by on March 02, 2003 at 12:16:10:

In order for the incomplete trinomial

16x^2 + 25y^2 + ?

to be a trinomial square, the missing term must be

1. -+400xy

2. -+400x^2y^2

3. -+20xy

4. -+40xy

Second Quastion:

Which of the following trinomials is a perfect square?

1. 36t^2 + 9s^2 - 9st

2. 36t^2 + 9s^2 - 18st

3. 36t^2 + 9s^2 + 18st

4. 36t^2 + 9s^2 - 36st

I am 69 years old retired individual that is trying to kill time by learning things that I had no oportunity to learn. Please not only give the answers but also explain. Thanks Ski