This isn't really a HW question, so I am posting it here. Hopefully someone will be able to help me, and I'm sure many of you will roll your eyes... I want to return one of my new calculators, but I'm not sure which one I should keep. I own the Casio FX-115ES and Sharp ELW516B, both unopened. My question is, can either of these find the roots of a polynomial to the nth degree? For example, 5x^7-4x^5+11x. And can either of them find complex solutions? Thank you for your time.