Question

the roots of x²+ kx +4 =0 are real and equal .find the k? ​

Answer 1

Answer:

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Answer 2

Answer:

The values of k=4and -4

Step-by-step explanation:

Given equation is x²+Kx+4=0

On comparing with ax²+bx+c=0

a=1;b=K;c=4

If the given equation has equal and real roots then the discriminant of the given equation is equal to zero.

=>D=b²-4ac=0

=>k²-4(1)(4)=0

=>k²-16=0

=>k²-4²=0

=>(k+4)(k-4)=0

=>k+4 =0 =>K=-4

=>k-4=0=>k=4

The values of k=4and -4