Q. 135.0( 2 Votes )

Find the value of

Answer :

kx(3x-10) + 25=0
3kx2-10kx + 25=0

This is a quadratic equation of form ax2 + bx + c=0


Where a=3k, b=-10k ,c=25


For equal roots, D=0


D=b2-4ac=0


Substituting the values of a,b and c


(-10k)2-4(3k)(25)=0


100k2-300k=0


100(k2-3k)=0


k(k-4)=0


There are two possible values of k, k=0 and k=3


But if k=0, then the equation will not remain quadratic,
k=3.


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