Question

If 9x*+Kx+1=0 has equal roots,
find the value of k​

Answer 1

Answer:

Step-by-step explanation:

Given equation

9x² +kx + 1 = 0

Comparing the given equation with ax² + bx + c = 0,then a = 9, b = k and c = 1.

Given equation has equal roots,

Discriminant = D = b² - 4ac = 0

⇒k² - 4 ( 9) ( 1) = 0

⇒ k² - 36 = 0

⇒ k² = 36

⇒ k = √36

⇒ k = 6 is the answer.