$(\,2\,x+\,3)\;(\,y+\,1) = $   ?

$\,7\,\,x^2\,y^2 +\,3$ $\,2\,\,x\,y +\,2\,\,x +\,3\,\,y +\,3$ $\,2\,\,x\,y +\,3$ $\,3\,\,x\,y +\,3\,\,x +\,4\,\,y +\,4$

$(\,3+\,y)\;(\,4+\,y) = $   ?

$\,\,y^2 +\,12$ $\,8\,\,y +\,12$ $\,2\,\,y^2 +\,9\,\,y +\,7$ $\,\,y^2 +\,7\,\,y +\,12$

$(\,x+\,5)\;(\,y+\,6) = $   ?

$\,\,x\,y +\,6\,\,x +\,5\,\,y +\,30$ $\,12\,\,x^2\,y^2 +\,30$ $\,\,x\,y +\,30$ $\,2\,\,x\,y +\,7\,\,x +\,6\,\,y +\,11$

$(\,b+\,6)\;(\,1+\,3\,b) = $   ?

$\,4\,\,b^2 +\,11\,\,b +\,7$ $\,3\,\,b^2 +\,6$ $\,22\,\,b +\,6$ $\,3\,\,b^2 +\,19\,\,b +\,6$

$(\,1\,-5\,t)\;(\,x+\,3) = $   ?

$\,\,x \,-3 +\,5\,\,t\,x \,-15\,\,t$ $\,\,x +\,3 \,-5\,\,t\,x \,-15\,\,t$ $\,-\,\,x +\,3 \,-5\,\,t\,x \,-15\,\,t$ $\,\,x +\,3 +\,5\,\,t\,x +\,15\,\,t$

$(\,x+\,5)\;(\,-2\,-4\,y) = $   ?

$\,-2\,\,x +\,4\,\,x\,y \,-10 \,-20\,\,y$ $\,-2\,\,x \,-4\,\,x\,y \,-10 \,-20\,\,y$ $\,-2\,\,x +\,4\,\,x\,y +\,10 \,-20\,\,y$ $\,2\,\,x \,-4\,\,x\,y +\,10 \,-20\,\,y$

$(\,5+\,2\,y)\;(\,-6+\,y) = $   ?

$\,2\,\,y^2 +\,17\,\,y +\,30$ $\,-2\,\,y^2 \,-17\,\,y \,-30$ $\,-2\,\,y^2 \,-7\,\,y \,-30$ $\,2\,\,y^2 \,-7\,\,y \,-30$

$(\,4\,-3\,y)\;(\,-3\,-6\,x) = $   ?

$\,-12 \,-24\,\,x +\,9\,\,y +\,18\,\,x\,y$ $\,-12 \,-24\,\,x \,-9\,\,y \,-18\,\,x\,y$ $\,12 \,-24\,\,x +\,9\,\,y +\,18\,\,x\,y$ $\,-12 \,-24\,\,x \,-9\,\,y +\,18\,\,x\,y$

$(\,4\,-\,a)\;(\,6\,-2\,a) = $   ?

$\,-2\,\,a^2 +\,2\,\,a +\,24$ $\,-2\,\,a^2 \,-14\,\,a +\,24$ $\,2\,\,a^2 \,-14\,\,a +\,24$ $\,-2\,\,a^2 \,-2\,\,a +\,24$

$(\,x\,-1)\;(\,-6\,x\,-2) = $   ?

$\,6\,\,x^2 +\,4\,\,x +\,2$ $\,-6\,\,x^2 +\,4\,\,x +\,2$ $\,6\,\,x^2 +\,8\,\,x +\,2$ $\,-6\,\,x^2 \,-4\,\,x +\,2$