Solve the equation x^3-5x^2+2x+8=0 given that -1 is a zero

Question

fanduekisses · Answer

idk I factored by grouping and ended up with x= {-4, sqrt(2), and 5 }

xapproachesinfinity · Answer

if x=-1 is zero
you can do synthetic division
or long division diving you polynomial by x+1

xapproachesinfinity · Answer

you equation in other words should be of the form
$$(x+1)(ax^2+bx+c)=0$$
you need to find that quadratic one

xapproachesinfinity · Answer

have you seen synthetic division before
or long division

xapproachesinfinity · Answer

hmm you said you did grouping, can you show how did you do it

xapproachesinfinity · Answer

the grouping would not work by the way
you need to know the other methods to do this
and you are not replying at all?

fanduekisses · Answer

I'm sorry I was reviewing a test I took. So I'll so synthetic division?

fanduekisses · Answer

oooohhh I get x = {-1, 2, 4}