Trinomial square


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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


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