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Mathematics 15 Online
OpenStudy (anonymous):

2(x+1)(x-1)(x+5)=0

OpenStudy (anonymous):

help me

OpenStudy (kainui):

With?

OpenStudy (unklerhaukus):

if a product equals zero one of the factors must be zero

OpenStudy (kainui):

Do you want to find the values of x or do you want to multiply it all together?

OpenStudy (anonymous):

i want to multiply it all together

OpenStudy (kainui):

What's your best guess? I'll help you figure out where you need help, if you need it.

OpenStudy (idku):

\[2(x+1)(x-1)(x+5)=0\]divide both sides by 2,\[(x+1)(x-1)(x+5)=0\]\[x=~~~ -1,~~~~~1,~~~-5\]

OpenStudy (kainui):

@idku good job at reading.

OpenStudy (idku):

This is a cubic function, \[2(x+1)(x-1)(x+5)=0~~~~~~~~~~->~~~~~~~~~~~~~2x^3+10x^2-2x-10\]

OpenStudy (idku):

the y-intercept is -10. To graph it (without calculus, just approximately,)|dw:1385995829352:dw| something like this, I am bad at drawing, it's going through (-5,0) (-1,0) (1,0) these are the x-intercepts and (0,-10) -- the y intercept.

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