2K + Cl2 --> 2KCl
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Using the discriminant for a quadratic equation the value of k works out as plus or minus 12.
k added to 2.5
It is a linear equation in the variable r.
Using the discriminant formula for a quadratic equation k has a value of 8/25 or maybe 0.
Equation: x^2 +2kx +10x +k^2 +5 = 0 Using the discriminant: (2k +10)^2 -4*1*(k^2 +5) = 0 Solving the discriminant: k = -2