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Ti84 and ti85 which one is better?
The TI-85 was the second graphing calculator made by Texas Instruments. (The first was the TI-81). The TI-84 is a much newer version and has more functionality and memory. The only real advantage that the TI-85 has over the TI-84 is that it costs less. As far as where you are allowed to use the calculator, almost every test or class that allows a TI-85 will allow a TI-84 as well. The TI-84 is a much better investment. (If the TI-84 is too expensive, look into getting a TI-83. This model is also newer than the TI-85.)
How much is it to buy a TI85?
Since TI-85 was discontinued, it don't have a price, you can only buy it at websites like eBay or Amazon. But not worth it, you can buy a pretty good calculator at this moment like TI-Nspire for 150€ or 150$ (depends on where you live). But if it is too expensive you can buy TI-84 Plus or TI-84 SilverEdition which also are good and you stay well served.
How do you factor this trinomial 5x ² plus 6x plus 7?
That doesn't factor neatly. Applying the quadratic formula, we find two imaginary solutions: (-3 plus or minus i times the square root of 26) divided by 5.x = -0.6 + 1.0198039027185568ix = -0.6 - 1.0198039027185568iwhere i is the square root of negative one.
