Factorise : `4y^2-12y+9`

Explanation

To factorise the expression \( 4y^2 - 12y + 9 \), we can follow these steps:

### Step 1: Identify the coefficients
The given expression is \( 4y^2 - 12y + 9 \). Here, we can identify:
- \( a = 4 \) (coefficient of \( y^2 \))
- \( b = -12 \) (coefficient of \( y \))
- \( c = 9 \) (constant term)

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