Question

3. If the roots of the quadratic equation x2 + 6x + k = 0 are equal, then the value
of 'k' is :
A. 9
B. -9
C. 8
D. 5.​

Answer 1

Step-by-step explanation:

Option A

9 is the value of k

Answer 2

Answer :

• The value of k is 9
• Option (A)

Given :

• If the roots of the quadratic equation x² + 6x + k = 0 are equal

To find :

• Value of k

Solution :

As we know that ,

• ax² + bx + c = 0 Then,

》b² - 4ac = 0 ... (1)equation

According To Question Given that ,

》x² + 6x + k = 0

Where, a = 1 , b = 6 and c = k

Putting the value in equation we get ,

》(6)² + 4(1) (k) = 0

》36 - 4k = 0

》k = 36/4

》k = 9

Hence The value of k is 9

More Explanation :

• A Qudratic equation is nothing but an equation that can be written in standard form
• ax² + bx + c = 0
• where , a , b and c are real numbers and a is not equal to zero