Evaluate ${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{dx}{(1+\sqrt[\phantom{2}]{x+98}{)}^3}$ using $u=1+\sqrt[\phantom{2}]{?}x+98$

$($Use symbolic notation and fractions where needed. Use $C$ for the arbitrary constant. Absorb into $C$ as much as possible.$)$

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{dx}{(1+\sqrt[\phantom{2}]{x}+98{)}^3}=$