(6x+3)*(3x+1)+(3x-1)*(6x+2)=
=18x²+6x+9x+3+18x²+6x-6x-2=
=36x²+15x+1=
=36*2²+15*2+1=
=36*4+30+1=
=144+31=
=175
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(6x+3)*(3x+1)+(3x-1)*(6x+2)=
=18x²+6x+9x+3+18x²+6x-6x-2=
=36x²+15x+1=
=36*2²+15*2+1=
=36*4+30+1=
=144+31=
=175