To simplify the expression \( \frac{4x^{100}}{-5x^2} \), follow these steps:
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Separate the coefficients and the variables: \[ \frac{4}{-5} \cdot \frac{x^{100}}{x^2} \]
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Simplify the coefficients: \[ \frac{4}{-5} = -\frac{4}{5} \]
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Simplify the variables using the property of exponents: \[ \frac{x^{100}}{x^2} = x^{100-2} = x^{98} \]
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Combine the results: \[ -\frac{4}{5} x^{98} \]
Thus, the fully simplified expression is: \[ -\frac{4}{5} x^{98} \]