Question

Write the value of lambda for which x square+4x +lambda=0 has equal roots

Answer 1

4×4-lambda×4=0
lambda=4

Answer 2

Answer:

4

Step-by-step explanation:

The formula when two roots of a quadratic equation are same-

b square - 4ac = 0

Here b=4 a=1 c= lambda

Therefore

16-4lambda=0

Or, lambda = 16/4= 4