Factorise `12a^2 b + 15ab^2`

Explanation

To factorise the expression \( 12a^2 b + 15ab^2 \), we will follow these steps:

### Step 1: Identify the common factors
First, we need to identify the common factors in both terms of the expression \( 12a^2 b \) and \( 15ab^2 \).

### Step 2: Factor each term
- For the first term \( 12a^2 b \):
- The factors are \( 12 = 2 \times 2 \times 3 \)
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