Processing Math: Done

From Förberedande kurs i matematik 1

In this right-angled triangle, the side of length 17 is the hypotenuse (it is the side which is opposite the right angle). The Pythagorean theorem then gives

172=82+x2

or

x2=172−82.

We get

x=172−82=289−64=225=925=3252=35=15.