Quote:
Originally Posted by bitnibbler  Hello,
I was wondering if someone could help me with a problem I am having with my nspire cas calculator. When I try to factor a perfect square trinomial like factor(4x^2 -36xy + 81y^2) it returns the following answer 4x^2+9(9y^2-4xy) instead of (2x-9y)^2, which is what the book that I am reading says it should be. I don't think that it is a calculator issue. I am more inclined to believe the problem is with me.
Thanx,
Jim |
The TI 89 will do the same thing if you input that expression into it.
The issue is this: its treating xy as a variable, instead of the product of two variables.
To fix that, type in (4x^2-36x*y+81y^2) and it should give you the desired result.
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