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0=-x^{2}+2x+15

 May 29, 2015

Best Answer 

 #1
avatar+130458 
+5

0=-x^{2}+2x+15   multiply through by -1

 

0 = x^2 - 2x - 15     factor

 

0 = (x -5) ( x + 3)    and setting each factor to 0, we have that x = 5 or x = -3

 

 

 May 29, 2015
 #1
avatar+130458 
+5
Best Answer

0=-x^{2}+2x+15   multiply through by -1

 

0 = x^2 - 2x - 15     factor

 

0 = (x -5) ( x + 3)    and setting each factor to 0, we have that x = 5 or x = -3

 

 

CPhill May 29, 2015

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