What is the x-intercept of y= x^3 +3x^2 +1

Question

anonymous · Answer

I tried to do it using synthetic division..but i cant points that make the function 0

amistre64 · Answer

you can try to get rid of that x^2 term ... and see if that helps

amistre64 · Answer

sub in (r-1) for x; or (r+1)

anonymous · Answer

what is r-1...? what does r mean?

anonymous · Answer

how can i factor out x^2 if 1 is there

amistre64 · Answer

r is just a variable to use instead of x

say x = r-1; then if the equation becomes easier to solve for r we can then find x

amistre64 · Answer

$$x=r+1$$gives me
$$r^3+6r^2+9r+5$$

anonymous · Answer

umm i will try ... need to eat dinner now..i will ask again if i dont get it...thanks!

amistre64 · Answer

its not a "normal" method, but at times it could be useful.

otherwise, use synthD and make sure all your positions are filled

amistre64 · Answer

http://www.wolframalpha.com/input/?i=x%5E3%2B3x%5E2%2B1 but quite frankly, its not a pretty site no matter what route you take