Question 916432

{{{20s^2+35st+15t^2}}}


{{{5(4s^2+7st+3t^2)}}}


{{{5(4s^2+3st+4st+3t^2)}}}


{{{5((4s^2+4st)+(3t^2+3st))}}}


{{{5(4s(s+t)+3t(t+s))}}}


{{{5(s+t)(4s+3t)}}}