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The "cubic"  \(x^3+2x^2-11x-12\) has three roots. What is their sum?

 

If you could explain how this was solved that would be great! Thankyou!

 Oct 18, 2018
 #1
avatar+100571 
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In the form   ax^3 + bx^2 + cx + d

 

The sum of the roots  is   -b/a

 

So....in this case.....  -2/1  =   -2

 

 

cool cool cool

 Oct 18, 2018

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