A physical quantity is measured as `Q = (2.1 ± 0.5)` units. Calculate the percentage error in `(1) Q^(2) (2) 2Q`.

Explanation

To solve the problem of calculating the percentage error in \( Q^2 \) and \( 2Q \) given the measurement \( Q = (2.1 \pm 0.5) \) units, we will follow these steps:

### Step 1: Understand the given values
We have:
- Measured value of \( Q = 2.1 \)
- Absolute error in \( Q \) (denoted as \( \Delta Q \)) = 0.5

### Step 2: Calculate the percentage error in \( Q^2 \)
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