quadratic equations

Asked by  | 12th Mar, 2009, 10:12: PM

Expert Answer:

It is given that .4 is a root of the quadratic equation x2+px-4=0 .

So we have: (0.4)2+0.4p-4=0

Hence p=9.6

Now x2+pk+k =0 has equal roots. It implies it's discriminant is 0.

Hence, p2=4k

k=p2 /4=(9.62 )/4=23.04

Answered by  | 13th Mar, 2009, 02:11: AM

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