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Urgent! Calculus Help!

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Break the interval 1≤x≤3 into 4 subintervals of length Δx=0.5, starting at 1, 1.5, 2, and 2.5. Find f(x)=x²-x+1 at these points:
f(1)=1,  f(1.5)=1.75,   f(2)=3,   f(2.5)=4.75.
 
Then the lower sum is
L4=(1+1.75+3+4.75)*0.5=5.25.
 
Notice how much the 4 rectangles underestimate the area under the graph, especially the rightmost one.