72 - k = 31
Therefore, k = 72 - 31
k = 41
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If you're talking about (K-0)=1, then the answer is most definitely 1.
That depends what the values of k and b are.
Using the discriminant for a quadratic equation the value of k works out as plus or minus 12.
2k = 5k-30 Subtract 5k from both sides: -3k = -30 Divide both sides by -3 to find the value of k remembering that a minus divided into a minus becomes a plus: k = 10