Find the antiderivative of functions by the method of inspection:`3x^2-e^x`

Explanation

To find the antiderivative of the function \(3x^2 - e^x\) using the method of inspection, we will break down the function into two parts and find the antiderivative for each part separately.

### Step-by-Step Solution:

1. **Identify the function to integrate**:
We have the function \(f(x) = 3x^2 - e^x\).

2. **Find the antiderivative of \(3x^2\)**:
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