Answer
$2(d^{2}+4)(2d-3)$
Work Step by Step
$4d^{3}=2.2.d.d.d$ and $6d^{2}=2.3.d.d$
Hence, $GCF=$$2.d.d=2d^{2}$
$16d=2.2.2.2.d$ and $24=2.2.2.3$
Hence, $GCF=2.2.2=8$
After grouping:
$=(4d^{3}-6d^{2})+ (16d-24)$
$=2d^{2}(2d-3)+8(2d-3)$
$=(2d^{2}+8)(2d-3)$
$=2(d^{2}+4)(2d-3)$