Posted by Kajal on Saturday, May 28, 2011 at 5:54pm.
f(x) is always above the x axis in that interval. Therefore just integrate the function from 1 to 4. I don't know what you mean by "the limit process".
The indefinite integral is x^4/2 -x^3/3 +x. That equals 128 -21.33 +4 = 110.67 at x = 4 and 0.50 -0.33 +1 = 1.17 at x = 1.
The area should be 110.67-1.17 = 109.50
My algebra tends to be sloppy, so my answer could be wrong, too.
thanks so much!!!
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