Question

Find the roots of the polynomial equation:
x³-2x²+10x+136=0

Answer 1

can you guess 1?

Answer 2

I got x = - 4 , x = 3 ± i 5 , but I'm not too good at these so I'm not sure

Answer 3

x = -4 goes to -1

Answer 4

woops I wrote 135 lol

Answer 5

my ti says only -4, but knowing that you can factor and get it to look nicer...

Answer 6

If you know a solution then use long division to simplify it:
\[(x^3-2x^2+10x+136)/(x+4)\]

Answer 7

zzrock3r sorry I don't understand, so you're saying only the -4 is correct right?

Answer 8

im now saying it, but my ti-89 is, do what @malevolence19 said, do you know how to do long devision of polynomials?

Answer 9

im not saying it*

Answer 10

Yes,I'll do that then.

Answer 11

do that, and you should be able to factor it to something nice like (x-a)(bx^2+cx+d) and you know how to deal with that...

Answer 12

ok got it ^-^ Thanks.