Equations, SM-Bank 015 A square with side length \(\large x\) has an area of \(81\ \text{cm}^2\). Write an equation and solve it to find the side length. (2 marks) Show Answers Only \(x^2=81\ \ ,\ \ x=9\ \text{cm}\) Show Worked Solution \(x^2\) \(=81\) \(x\) \(=\sqrt{81}\) \(x\) \(=9\) \(\therefore\ \text{The side length is }9\ \text{cm}\)