Substitution in the Indefinite Integral

Part $1.$

Using the substitution: u$=$x$^(8)-3.$ Re$-$write the indefinite integral then evaluate in terms of u$.$

$\backslash$int $-5$x$^(7)($x$^(8)-3)^(15)$dx$=\backslash$int $=$

Note: answer should be in terms of u only

Part $2.$

Back substituting in the antiderivative you found in Part $1.$ above we have

$\backslash$int $-5$x$^(7)($x$^(8)-3)^(15)$dx$=$

Note: answer should be in terms of x only