$(\,1+\,2\,x)\;(\,3+\,6\,y) = $   ?

$\,12\,\,x\,y +\,3$ $\,4 +\,7\,\,y +\,5\,\,x +\,8\,\,x\,y$ $\,24\,\,x^2\,y^2 +\,3$ $\,3 +\,6\,\,y +\,6\,\,x +\,12\,\,x\,y$

$(\,a+\,3)\;(\,5+\,a) = $   ?

$\,2\,\,a^2 +\,10\,\,a +\,8$ $\,\,a^2 +\,8\,\,a +\,15$ $\,\,a^2 +\,15$ $\,9\,\,a +\,15$

$(\,6\,a+\,2)\;(\,3+\,b) = $   ?

$\,18\,\,a +\,6\,\,a\,b +\,6 +\,2\,\,b$ $\,26\,\,a^2\,b^2 +\,6$ $\,6\,\,a\,b +\,6$ $\,9\,\,a +\,7\,\,a\,b +\,5 +\,3\,\,b$

$(\,2+\,2\,t)\;(\,3\,t+\,6) = $   ?

$\,6\,\,t^2 +\,12$ $\,6\,\,t^2 +\,18\,\,t +\,12$ $\,24\,\,t +\,12$ $\,5\,\,t^2 +\,13\,\,t +\,8$

$(\,6\,x\,-2)\;(\,2+\,y) = $   ?

$\,-12\,\,x +\,6\,\,x\,y +\,4 \,-2\,\,y$ $\,-12\,\,x +\,6\,\,x\,y \,-4 \,-2\,\,y$ $\,-12\,\,x +\,6\,\,x\,y \,-4 +\,2\,\,y$ $\,12\,\,x +\,6\,\,x\,y \,-4 \,-2\,\,y$

$(\,2+\,y)\;(\,-3\,x\,-6) = $   ?

$\,-6\,\,x \,-12 \,-3\,\,x\,y \,-6\,\,y$ $\,-6\,\,x \,-12 +\,3\,\,x\,y +\,6\,\,y$ $\,6\,\,x \,-12 +\,3\,\,x\,y \,-6\,\,y$ $\,-6\,\,x +\,12 \,-3\,\,x\,y +\,6\,\,y$

$(\,1\,-4\,b)\;(\,3\,b+\,2) = $   ?

$\,12\,\,b^2 \,-5\,\,b +\,2$ $\,-12\,\,b^2 \,-5\,\,b +\,2$ $\,12\,\,b^2 \,-5\,\,b \,-2$ $\,-12\,\,b^2 \,-11\,\,b \,-2$

$(\,t\,-5)\;(\,-4\,-\,x) = $   ?

$\,-4\,\,t +\,\,t\,x +\,20 \,-5\,\,x$ $\,-4\,\,t \,-\,\,t\,x +\,20 +\,5\,\,x$ $\,-4\,\,t \,-\,\,t\,x \,-20 +\,5\,\,x$ $\,4\,\,t \,-\,\,t\,x +\,20 +\,5\,\,x$

$(\,1+\,y)\;(\,-4\,y\,-1) = $   ?

$\,-4\,\,y^2 \,-5\,\,y \,-1$ $\,-4\,\,y^2 \,-5\,\,y +\,1$ $\,-4\,\,y^2 +\,3\,\,y +\,1$ $\,-4\,\,y^2 +\,5\,\,y \,-1$

$(\,1\,-\,x)\;(\,-6\,-\,x) = $   ?

$\,\,x^2 +\,7\,\,x \,-6$ $\,\,x^2 \,-7\,\,x +\,6$ $\,-\,\,x^2 +\,5\,\,x \,-6$ $\,\,x^2 +\,5\,\,x \,-6$