First, we'll evaluate the expressions by substituting the values of \( m \) and \( n \). Given \( m = -5 \) and \( n = 5 \):
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For the expression \( m + n \): \[ m + n = -5 + 5 = 0 \]
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For the expression \( mn + n \): \[ mn = m \cdot n = -5 \cdot 5 = -25 \] Now substituting this into \( mn + n \): \[ mn + n = -25 + 5 = -20 \]
Now, combining both results, we have:
- \( m + n = 0 \)
- \( mn + n = -20 \)
Thus, the results are: \[ m + n = 0 \quad \text{and} \quad mn + n = -20 \]