U sub problem with definite integral.?

I solved the above problem to be integral 3u^(1/3) from 1 to 8 and put u as the 8y-5y^2+4y^3+1 but when I put the limits into this I get 3(1793^(1/3))-6 MML says it should be 3 but the only way I can figure out how they got 3 is by putting the limits 8 and 1 into 3u^(1/3). Is that how you solve this type of... show more I solved the above problem to be integral 3u^(1/3) from 1 to 8 and put u as the 8y-5y^2+4y^3+1 but when I put the limits into this I get
3(1793^(1/3))-6
MML says it should be 3 but the only way I can figure out how they got 3 is by putting the limits 8 and 1 into 3u^(1/3). Is that how you solve this type of problem because I thought after finding u you were supposed to evaluate as F(b)-F(a).
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