Question

the value of k for which the quadratic equation2x²+Kx+2 has has equal roots is​

Answer 1

Answer:

4

Step-by-step explanation:

for equal roots d=0

d=bsquare - 4ac

=k sq. -16=0

k=4

Answer 2

Answer:

k = +4, k = -4

Step-by-step explanation:

2x² + kx + 2 = 0

a = 2

b = k

c = 2

Since, this equation has equal roots

Hence, Δ = 0

b² - 4ac = 0

(k)² - 4(2)(2) = 0

k² - 16 = 0

k² = 16

k = √16

k = ±4

Ans: k = +4,

        k = -4

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