$(\,3\,a+\,3)\;(\,b+\,4) = $   ?

$\,3\,\,a\,b +\,12\,\,a +\,3\,\,b +\,12$ $\,18\,\,a^2\,b^2 +\,12$ $\,4\,\,a\,b +\,7\,\,a +\,4\,\,b +\,7$ $\,3\,\,a\,b +\,12$

$(\,6\,a+\,2)\;(\,1+\,3\,a) = $   ?

$\,18\,\,a^2 +\,12\,\,a +\,2$ $\,9\,\,a^2 +\,12\,\,a +\,3$ $\,30\,\,a +\,2$ $\,18\,\,a^2 +\,2$

$(\,3+\,3\,a)\;(\,2\,b+\,5) = $   ?

$\,6\,\,a\,b +\,15$ $\,27\,\,a^2\,b^2 +\,15$ $\,5\,\,b +\,8 +\,5\,\,a\,b +\,8\,\,a$ $\,6\,\,b +\,15 +\,6\,\,a\,b +\,15\,\,a$

$(\,2\,t+\,1)\;(\,3+\,t) = $   ?

$\,9\,\,t +\,3$ $\,2\,\,t^2 +\,3$ $\,2\,\,t^2 +\,7\,\,t +\,3$ $\,3\,\,t^2 +\,7\,\,t +\,4$

$(\,4+\,b)\;(\,3\,a\,-4) = $   ?

$\,12\,\,a +\,16 \,-3\,\,a\,b \,-4\,\,b$ $\,-12\,\,a \,-16 +\,3\,\,a\,b \,-4\,\,b$ $\,12\,\,a \,-16 +\,3\,\,a\,b \,-4\,\,b$ $\,12\,\,a +\,16 +\,3\,\,a\,b +\,4\,\,b$

$(\,2+\,2\,x)\;(\,-4\,y\,-1) = $   ?

$\,8\,\,y \,-2 \,-8\,\,x\,y +\,2\,\,x$ $\,-8\,\,y \,-2 \,-8\,\,x\,y \,-2\,\,x$ $\,8\,\,y \,-2 +\,8\,\,x\,y \,-2\,\,x$ $\,-8\,\,y +\,2 \,-8\,\,x\,y +\,2\,\,x$

$(\,3+\,4\,t)\;(\,-2\,t+\,1) = $   ?

$\,-8\,\,t^2 +\,10\,\,t \,-3$ $\,8\,\,t^2 +\,10\,\,t +\,3$ $\,-8\,\,t^2 \,-2\,\,t +\,3$ $\,-8\,\,t^2 \,-10\,\,t +\,3$

$(\,4\,b\,-2)\;(\,-3\,-5\,a) = $   ?

$\,12\,\,b +\,20\,\,a\,b +\,6 +\,10\,\,a$ $\,-12\,\,b \,-20\,\,a\,b \,-6 +\,10\,\,a$ $\,-12\,\,b +\,20\,\,a\,b +\,6 +\,10\,\,a$ $\,-12\,\,b \,-20\,\,a\,b +\,6 +\,10\,\,a$

$(\,x\,-3)\;(\,6\,x\,-1) = $   ?

$\,-6\,\,x^2 \,-19\,\,x \,-3$ $\,6\,\,x^2 \,-19\,\,x +\,3$ $\,6\,\,x^2 +\,17\,\,x \,-3$ $\,-6\,\,x^2 +\,17\,\,x +\,3$

$(\,1\,-3\,x)\;(\,-4\,-5\,x) = $   ?

$\,-15\,\,x^2 \,-17\,\,x \,-4$ $\,-15\,\,x^2 +\,17\,\,x \,-4$ $\,15\,\,x^2 +\,7\,\,x +\,4$ $\,15\,\,x^2 +\,7\,\,x \,-4$