Solve each of the expressions for x using the quadratic formula and the x is small approximation. In which of the following expressions is the x is small approximation valid?

In a complete sentence, describe the factor(s) that tend to make the x is small approximation valid in an expression.

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a. x²/(0.2-x) = 1.3 x 104 b. x²/(0.2 x) = 1.3 c. x²/(0.2-x) = 1.3 × 10-4 d. x²/(0.01-x) = 1.3 x 10-4