Find the square root of the following:

4x² + 9y² + 25z²–12xy + 30yz–20zx

The above expression can be rewritten as

(2x)² + (–3y)² + (–5z)² + 2((–3y)×(2x) + (–5z)×(–3y) + (2x)×(–5z))

The above expression is in the form of

(a–b–c)² = a² + b² + c² + 2(–ab + bc – ca)

So the expression becomes (2x–3y–5z)²

Square Root = √(2x–3y–5z)²

|2x–3y–5z|