Question

Find the value of k for which quadratic equation x square + kx + 9 = 0 has equal roots.​

Answer 1

Answer:

k = ±6

Step-by-step explanation:

x²+kx+9=0

is in the form ax²+bx+c=0

a = 1

b = k

c = 9

since the equation has equal roots, Δ = 0

Δ = b²-4ac = 0

b²- 4ac = 0

b²=4ac

k² = 4(1)(9)

k² = 36

k = ± 6

Hence the answer ;)