## Introductory Algebra for College Students (7th Edition)

Use the Pythagorean Theorem. Let l be the length of the ladder. $l^2=8^2+10^2$ Simplify. $l^2=64+100$ $l^2=164$ Take the square root of each side. $\sqrt{l^2}=\sqrt{164}$ Simplify and round. $l\approx12.8$