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Given that x = -5 is a root to the quadratic 2x^2 + px - 15 = 0, and the quadratic equation p(x^2 + x) + k = 0 has equal roots, find k.

 Apr 12, 2022

Best Answer 

 #1
avatar+55 
+2

7/4

 

2(−5)^2−5p−15=0 which solves to p=7

 

Then we get 7x^2+7x+k=0

 

b2−4ac has to = to 0 so k = 7/4

 Apr 12, 2022
 #1
avatar+55 
+2
Best Answer

7/4

 

2(−5)^2−5p−15=0 which solves to p=7

 

Then we get 7x^2+7x+k=0

 

b2−4ac has to = to 0 so k = 7/4

qjin27 Apr 12, 2022
 #2
avatar+122390 
0

Very nice, qjin  !!!

 

 

cool cool cool

CPhill  Apr 12, 2022

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