## Algebra 1: Common Core (15th Edition)

We are given the equation: $\sqrt{( (x)^{2} + (4x)^{2} )}$ It is said that the ladder is 5 feet away from the wall; thus, x=5, and we plug it into the equation: =$\sqrt{( (x)^{2} + (4x)^{2} )}$ =$\sqrt{( (5)^{2} + (4(5))^{2} )}$ =$\sqrt{(425)}$ =20.6 ft