5. \( (h-3)^{2} \) for \( h=5 \)

To solve \( (h-3)^{2} \) for \( h=5 \), first substitute 5 into the expression: \[ (5-3)^{2} = (2)^{2} = 4. \] So, the answer is 4. Now, if you're ever faced with a similar equation, just remember that substituting values is key! Don't rush into calculations; double-checking your substitute makes for less confusion down the road. For example, always ensure you correctly identify operations like addition and subtraction before squaring. It’s a common pitfall!