determine the values of k if kx^2 -5kx+25 has real and equal roots
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if it has real and equal roots then discriminant= 0
b2-4ac=0
(-5k)2 - 4(k)(25)=0
25k2 -100k=0
k2-4k= 0
k(k-4)=0
k= 0 or k=4
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