Answer
$s^{2}$(20s+t)(s+3t)
Work Step by Step
20$s^{4}$+61$s^{2}$t+3$s^{2}$$t^{2}$=
$s^{2}$(20$s^{2}$+61st+3$t^{2}$)=
$s^{2}$(20$s^{2}$+60st+st+3$t^{2}$)=
$s^{2}$[20s(s+3t)+t(s+3t)]=
$s^{2}$(20s+t)(s+3t)
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