# Math Help - Question about partition of [1,2]

1. ## Question about partition of [1,2]

I am facing difficulty to solve this problem.i want to solve this question from lower and upper sum method plz help me to solve it

2. What is meant by choosing a suitable partition? Just integrating directly shows that the inequality is true since $\displaystyle 3.5\leq 3.75\leq 4$