Question

Find the value(s) of k, for which the equation kx²-kx + 1 = 0  has equal roots.

Answer 1

For equal roots, b² -4ac=0 

Here, a= k, b= -k and c=1 

 k² - 4(k)(1)=0

i.e. k(k- 4)=0 

i.e. k=0 or k= 4 

rejecting k=0, we get k= 4.