Find the value of K , for which the equation: x2 - kx +4 = 0 , has tow equal roots.

Asked by Anjana S | 23rd Nov, 2014, 07:18: PM

Expert Answer:

C o n s i d e r space t h e space g i v e n space e e q u a t i o n : x squared minus k x plus 4 equals 0 S i n c e space t h e space g i v e n space e q u a t i o n space h a s space e q u a l space r o o t s comma t h e space v a l u e space o f space t h e space d i s c r i m i n a n t space i s space z e r o. T h a t space i s comma space b squared minus 4 a c equals 0 rightwards double arrow k squared minus 4 cross times 1 cross times 4 equals 0 rightwards double arrow k squared minus 16 equals 0 rightwards double arrow k squared equals 16 rightwards double arrow k equals plus-or-minus 4

Answered by Vimala Ramamurthy | 24th Nov, 2014, 09:00: AM