$(\,3+\,5\,x)\;(\,1+\,6\,y) = $   ?

$\,53\,\,x^2\,y^2 +\,3$ $\,30\,\,x\,y +\,3$ $\,4 +\,9\,\,y +\,6\,\,x +\,11\,\,x\,y$ $\,3 +\,18\,\,y +\,5\,\,x +\,30\,\,x\,y$

$(\,4+\,a)\;(\,a+\,5) = $   ?

$\,2\,\,a^2 +\,11\,\,a +\,9$ $\,\,a^2 +\,9\,\,a +\,20$ $\,10\,\,a +\,20$ $\,\,a^2 +\,20$

$(\,3\,x+\,2)\;(\,2+\,3\,y) = $   ?

$\,21\,\,x^2\,y^2 +\,4$ $\,6\,\,x +\,9\,\,x\,y +\,4 +\,6\,\,y$ $\,5\,\,x +\,6\,\,x\,y +\,4 +\,5\,\,y$ $\,9\,\,x\,y +\,4$

$(\,4\,t+\,6)\;(\,5+\,2\,t) = $   ?

$\,8\,\,t^2 +\,30$ $\,8\,\,t^2 +\,32\,\,t +\,30$ $\,6\,\,t^2 +\,17\,\,t +\,11$ $\,40\,\,t +\,30$

$(\,1+\,y)\;(\,x\,-4) = $   ?

$\,\,x +\,4 +\,\,x\,y \,-4\,\,y$ $\,\,x \,-4 +\,\,x\,y \,-4\,\,y$ $\,-\,\,x \,-4 +\,\,x\,y +\,4\,\,y$ $\,\,x \,-4 \,-\,\,x\,y +\,4\,\,y$

$(\,3\,b\,-6)\;(\,a\,-3) = $   ?

$\,3\,\,a\,b \,-9\,\,b +\,6\,\,a \,-18$ $\,3\,\,a\,b \,-9\,\,b \,-6\,\,a \,-18$ $\,3\,\,a\,b \,-9\,\,b \,-6\,\,a +\,18$ $\,-3\,\,a\,b \,-9\,\,b +\,6\,\,a +\,18$

$(\,b+\,4)\;(\,2\,b\,-1) = $   ?

$\,2\,\,b^2 \,-9\,\,b \,-4$ $\,-2\,\,b^2 \,-9\,\,b \,-4$ $\,2\,\,b^2 +\,7\,\,b \,-4$ $\,2\,\,b^2 +\,9\,\,b \,-4$

$(\,5\,y\,-4)\;(\,-4\,x\,-5) = $   ?

$\,-20\,\,x\,y \,-25\,\,y +\,16\,\,x +\,20$ $\,20\,\,x\,y \,-25\,\,y +\,16\,\,x \,-20$ $\,-20\,\,x\,y +\,25\,\,y +\,16\,\,x \,-20$ $\,-20\,\,x\,y \,-25\,\,y \,-16\,\,x \,-20$

$(\,3\,a\,-2)\;(\,2\,a\,-1) = $   ?

$\,-6\,\,a^2 \,-7\,\,a \,-2$ $\,-6\,\,a^2 \,-\,\,a +\,2$ $\,6\,\,a^2 \,-7\,\,a +\,2$ $\,-6\,\,a^2 \,-7\,\,a +\,2$

$(\,5\,t\,-4)\;(\,-\,t\,-6) = $   ?

$\,-5\,\,t^2 +\,34\,\,t +\,24$ $\,-5\,\,t^2 \,-26\,\,t +\,24$ $\,5\,\,t^2 \,-26\,\,t \,-24$ $\,-5\,\,t^2 +\,34\,\,t \,-24$