^ But, does that work when the answer's imaginary? Also, I was taught another way, where you can graph the equation and then look for where it intersects the x-axis. Then just go to 2nd, Trace, and then 2: zero, if you're using a TI-83 or other related model. Move the cursor to the left of where the intersection is and hit enter, and then right of the intersection and hit enter again. Put it one more time somewhere in between the two and hit enter once more--that'll show you the correct x-value.
Hint: For anybody else out there working with imaginary numbers, if you're given one of the imaginaries, the opposite of it will also be a solution. They always come in pairs as a rule. So since 2i was given, you automatically assume -2i is true, too. Wow, I finally understand enough math to answer something... O.O |