What must be added to each of the following expressions to make it a whole squares?
`4x^2-12 x+7`
(ii) `4x^2-20 x+20`

Explanation

To solve the problem of what must be added to the given expressions to make them perfect squares, we will follow these steps:

### Part (i): Expression `4x^2 - 12x + 7`

1. **Identify the quadratic expression**: The expression is \(4x^2 - 12x + 7\).
2. **Factor out the coefficient of \(x^2\)**: We can factor out 4 from the first two terms:
\[
4(x^2 - 3x) + 7
...