ACT Calculator Hacks | Imaginary Numbers Made Easy
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- Опубликовано: 29 ноя 2021
- Working with imaginary numbers on the ACT is easy if you use your calculator! I’m so excited to show you how to use your TI-83, TI-84, or TI-89 calculator to make some of the hardest ACT math questions ABSURDLY EASY!
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Just a quick reminder, when the ACT says “Imaginary Numbers”, “Complex Numbers”, i² = -1, or i = √-1, you know they are about to give you an “imaginary numbers question”. You can always use “SECOND” then “PERIOD” to get the “i” symbol and work with it!
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Thanks for the video !
Glad you liked it! Are you taking the test soon?!
@@GRANITE-EDUCATION yes ! I will be taking it in July. I made a 17 on my first one and have been improving slowly. After a few weeks of studying I got a 19 on my most recent practice test
@@r.i.pbruser5883 Great work on steady improvement!
This video was very informative but I don't understand one of the problems. At 2:55, why do you put (2-i)/(-3+i) into the calculator when the original problem was (2-i)/(-3-i)? I am just learning about imaginary numbers and this confused me.
Thanks for pointing this out, Sahar. The question in the video is written incorrectly - it should be: (2-i)/(-3+i) = ?
Sorry for that error!
when I put i^8 and i^12 in my TI-84 Plus it gives me 1+2E-13i, is there some way to avoid my calculator from saying that?
This is an incredibly good question. Basically your calculator is saying: 1 + 0.00000000000001 i, in other words 1 + 0i
Unfortunately, TI-84 calculators don't always round properly. When I get these types of results I always just say "ok I know that is basically zero". Off the top of my head, I don't know of a way to make the TI-84 "round more accurately", but i'm going to look into it for you and i'll reply to this thread if I figure out a solution!
@@GRANITE-EDUCATION thank you so much:)
Ok i've figured something out for you! When you click the "MODE" button. On the second row it'll say "normal" | "sci" | "eng". Which one do you have selected right now?
@@GRANITE-EDUCATION I have normal selected
Ok awesome and the row below that, do you have "float" selected?
Well too bad that calculator is banned on the test and the act has its own calculator so
thanks for watching!
On the one I took it’s not banned so