Question

if one of the roots of quadratic equation is 4, then the value of p is:​

Answer 1

Answer:

Since −4 is a root of the equation x  

2

+px−4=0

∴(−4)  

2

+p×(−4)−4=0⇒16−4p−4=0⇒4p=12⇒p=3

The equation x  

2

+px+k=0 has equal roots

∴ Discriminant =0

⇒p  

2

−4k=0⇒k=  

4

9