Please help! I'm not good with these sort of problems. I am pretty confuse: write the equations of a polynomial with rational coefficients having roots of -1,3 and 2-i.

Question

misty1212 · Answer

$$(x+1)(x-3)$$ will give the first two roots

misty1212 · Answer

to find the quadratic equation with zeros of $a\pm bi$ use 
$$x^2-2ax+a^2+b^2$$

anonymous · Answer

Thank you ! You're absolutely awesome.

misty1212 · Answer

lol glad to help you 
you good from there?

anonymous · Answer

I think so :). Thanks!^^

misty1212 · Answer

you're welcome

misty1212 · Answer

$$(x+1)(x-3)(x^2-4x+5)$$

misty1212 · Answer

if you don't want to risk an algebra mistake use this http://www.wolframalpha.com/input/?i=%28x%2B1%29%28x-3%29%28x^2-4x%2B5%29

anonymous · Answer

Thank you! I see what I did wrong I multiplied everything. And thanks for the tip! your brilliance is once again appreciated!

misty1212 · Answer

lol thanks dear

anonymous · Answer

no prob and thank you^^.