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What are Vieta's formulas? Why do they matter so much.

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 Apr 13, 2020
 #1
avatar+21004 
+2

If you have a quadratic equation:  y  =  ax2 + bx + c  that has roots  r1  and  r2, then  

  r1 + r2  =  -b/a     and     r1 · r2  =  c/a

 

They make some of the questions about quadratics quicker to solve.

 

For a fuller discussion, go to Wikipedia ...

 Apr 13, 2020
 #2
avatar+4568 
+2

This also ties in for quadratic, cubics, and other higher degree polynomials.

 Apr 13, 2020

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