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\[\int\limits_{}^{}8.1x ^{2} + 8.4x - 7dx\]
\[\int x^ndx=\frac{x^{n+1}}{n+1}\]
\[{8.1\over 3} x ^{3} + {8.4x ^{2} \over 2} - 7x\]

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Other answers:

looks right to me although remember to add +c you are dealing with an indefinite integral
yes i forgot the plus c in the end but are you sure that is correct ? :D
thanks mate
you can also simplify it but you can usually use wolfram alpha to check your answers although be careful their answers wont always match yours when you are integrating as it might use a different method than you
cheers for that appreciate it

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