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Mathematics 18 Online
OpenStudy (vera_ewing):

What are the roots of this function?

OpenStudy (vera_ewing):

OpenStudy (vera_ewing):

I know \[y = x^{3}+4x^{2}+3x=0\]

Nnesha (nnesha):

roots/solutions/zeros/x-intercepts: are points where line intersect the x-axis

OpenStudy (anonymous):

The roots are simply the x-intercepts. Just get them from the graph

OpenStudy (vera_ewing):

But is there another way to write the roots?

OpenStudy (anonymous):

Find the zeros of the equation by looking at the degree...

OpenStudy (anonymous):

Are you on zeros of polynomial equations yet? Or?

OpenStudy (anonymous):

This cubic is easily factored. Then set each factor equal to zero to get the roots.

OpenStudy (anonymous):

Yes just factor it

Nnesha (nnesha):

that's polynomial equation you will write roots as x= 1st root,,2nd root,3rd root

OpenStudy (anonymous):

In what way? Do you mean simplify the roots?

OpenStudy (anonymous):

where does it hit the x axis?

OpenStudy (anonymous):

We've told you that the roots are the x-intercepts, the points where the graph meets the x-axis. Look at the graph and write down those three x-values.

Nnesha (nnesha):

no. in other words roots are x-intercept ( a point where line intersect x-axis)|dw:1445993808576:dw|

OpenStudy (vera_ewing):

So the roots are (0,0) ; (-1, 0) ; (-3, 0) ?

Nnesha (nnesha):

looks good

OpenStudy (vera_ewing):

Ok, thanks!!

Nnesha (nnesha):

you can check ur answer by substituting x for each root if you get 0 as final answer then 100% those numbers are the root

Nnesha (nnesha):

np

OpenStudy (vera_ewing):

For some reason, I can't type that into the answer box...

OpenStudy (vera_ewing):

Nnesha (nnesha):

those are ordered pair x = 1st root , 2nd root , 3rd root write like this

OpenStudy (anonymous):

Technically, the roots are just the x-values where y=0, so you wouldn't write ordered pairs. The roots are \[x=\left\{ -3,-1,0 \right\}\]

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