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Using the formula to slove the given quadratic to find the roots there is a term involving the square-root of (-1)2 - 4(-40)(k). This expression has to be positive or zero if the roots are real. So 1+160k has to be positive or zero (ie >=0). So k>=-1/160

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12y ago
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Q: What is the value of K in kx2-x-40 has two distinct real roots?
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