Using the substitution: u$=$x$^(9)-1.$ Re$-$write the indefinite integral then evaluate in terms of u$.\backslash$int $-4$x$^(8)($x$^(9)-1)^(12)$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 $-4$x$^(8)($x$^(9)-1)^(12)$dx$=($du$)/(9$x$^(8))$ Note: answer should be in terms of x only