# Checking if Trinomial is factorable on TI-84

• Nov 2nd 2008, 09:22 PM
intodesi
Checking if Trinomial is factorable on TI-84
Hello, I am helping my sister try and figure out some stuff on her tI-84. Her teacher has asked her to use her calculator to determone if a trinomial is factorable.

I have googled and so has she and we have been unable to find anything that helps our cause..

Intodesi
• Nov 3rd 2008, 03:22 AM
mr fantastic
Quote:

Originally Posted by intodesi
Hello, I am helping my sister try and figure out some stuff on her tI-84. Her teacher has asked her to use her calculator to determone if a trinomial is factorable.

I have googled and so has she and we have been unable to find anything that helps our cause..

Intodesi

What sort of trinomial?

A quadratic trinomial of the form ax^2 + bx + c can be factored (using real numbers) if the graph of y = ax^2 + bx + c has x-intercepts ......
• Nov 7th 2008, 04:40 PM
ST47
If it is a simple quadratic, as I suspect it is:

it is a perfect square if B^2-4AC is zero
it can be factored over the REALS if B^2-4AC is positive
it can be factored over the RATIONALS if B^2-4AC is a perfect square
it can be factored over the INTEGERS if 2a divides both b and sqrt(b^2-4ac)