This question is concerned with calculating the work required to stretch a spring. A certain 'engineering' spring does not obey Hooke's law. Instead, the tension http://place32.placementtester.com:8...nlooffgimg.gif in the spring when it is extended a distance http://place32.placementtester.com:8...gppfghemgb.gif beyond its natural length is given by

http://place32.placementtester.com:8...balhhfmhje.gif

Find the work done in stretching the spring from x = 3 to x = 26

What are the steps to solving this?