toughie

let n be 1

and therefore f^'(x)=k(x²-1)^k-12x

has three real roots and we need 7 more roots to get the given condn and so the other roots shud be imaginary which can be possible if k=9

can ne 1 explain me abt the method of finding repeated roots

@subash the graph for the function (x^2-1)^9

shud be like this

so the given function cant have more than two real roots therefore the qn is rong

some one try this

this one from Bmat

[3]

wo nahi.. ek stupid sa q post kiye the.. post karte sath samjh me a gaya.. so mita diye... but agar koi padh lliya hoga isliye... upar wala post kiye...

post ur method please abhishek

i will do such assumptions in exams da.unfortunately it will get me +ive marks for a gr8er xtent

no da we cant take it as one .

sank... how can u take n = 1????????/

[11]

chek ur differenciation in f^'x

is it derivative or anti derivative

k equals 9

dont call him stupid da

becos he was miles higher than me

so if u call him stupid then

i am (very)^milesstupid

ya better..............................

ive changed the question

sry for the mistake question changed

it is (x²-1)^k

my dear akand .clearly the eqn is quadratic.its derivative cant have more than two roots but in the option it is given dat the roots are higher than two.

is tht k belongs to N???..................wel it has to be...hehe