posted by Tim .
Finding area under a curve
2x^2 -4x +1
is your curve y = 2x^2 - 4x + 1 ?
Is your region between the curve and the x-axis within your stated domain ?
Did you notice that the parabola has an x-intercept within your domain?
its from 1 to 3 on the x axis including when it crosses underneath, you subtract that (its like negative area)