medal for best :)
solve using the fundamental theorem of algebra:
v=x^3+11x+28

Question

medal for best :)
solve using the fundamental theorem of algebra:
v=x^3+11x+28

anonymous · Answer

I really just need help getting started....

anonymous · Answer

it is cubic, so it is going to be a problem
you might could guess and check for this
guess only negative numbers that divide 28

anonymous · Answer

but what am I guessing?

anonymous · Answer

i am not sure who wrote this problem, but you do not "solve" anything using the fundamental theorem of algebra

anonymous · Answer

i mean, am i factoring this or...?

anonymous · Answer

"solve" in this case means find the zeros

anonymous · Answer

okay, "find the solutions"?

anonymous · Answer

$$x^3+11x+28 =0$$

anonymous · Answer

so am i factoring?

anonymous · Answer

you can't factor this one using integers
there is not typo in this question, right?

uri · Answer

I think it should be x^2

anonymous · Answer

no typo, but i can factor it into (x^2+4x)(x+7), right?

anonymous · Answer

no

anonymous · Answer

http://www.wolframalpha.com/input/?i=x^3%2B11x%2B28%3D0

anonymous · Answer

oops. i didn't have a typo, i just created the problem wrong... im in the middle of a project and this is what i got as a result of my last part.... 
should be x^3 +11x^2+28

anonymous · Answer

http://www.wolframalpha.com/input/?i=x^3%2B11x^2%2B28%3D0

anonymous · Answer

*28x

anonymous · Answer

lol

anonymous · Answer

$$ x^3 +11x^2+28x=0$$ we can do

anonymous · Answer

today is just not my day, im sorry 
anyway, NOW can i factor into (x^2+4x)(x+7)?

anonymous · Answer

each term has a common factor of $x$

anonymous · Answer

$$x(x^2+11x+28)$$ is the first step

anonymous · Answer

okay

uri · Answer

Then find a number when adding is 11 and multiplying is 28

anonymous · Answer

7 and 4?

anonymous · Answer

now maybe you can factor $x^2+11x+28$ i can't because i suck at factoring, do what @uri says
and tell your math teacher one does not "solve" anything with the fundamental theorem of algebra!

anonymous · Answer

ill be sure to pass along the message, thanks :)

uri · Answer

Ya so
x^2+11x+28
x^2+7x+4x+28

Find common now

anonymous · Answer

so... @uri would my next step be x(x+4)(x+7)?

uri · Answer

x(x+7)+4(x+7)

anonymous · Answer

okay, not following but ill play along

uri · Answer

Answer will be x(x+7)(x+4)

anonymous · Answer

and that's the fundamental theorem of algebra?

uri · Answer

Well ye

anonymous · Answer

that is so easy, why they gotta come up with crazy fancy names for everything when they could just say "find the zeros"
anyway thanks :)

uri · Answer

yw!