$(\,5+\,5\,x)\;(\,2+\,6\,y) = $   ?

$\,7 +\,11\,\,y +\,7\,\,x +\,11\,\,x\,y$ $\,30\,\,x\,y +\,10$ $\,70\,\,x^2\,y^2 +\,10$ $\,10 +\,30\,\,y +\,10\,\,x +\,30\,\,x\,y$

$(\,2+\,6\,a)\;(\,3+\,a) = $   ?

$\,7\,\,a^2 +\,12\,\,a +\,5$ $\,6\,\,a^2 +\,6$ $\,26\,\,a +\,6$ $\,6\,\,a^2 +\,20\,\,a +\,6$

$(\,6+\,2\,x)\;(\,3\,y+\,1) = $   ?

$\,9\,\,y +\,7 +\,5\,\,x\,y +\,3\,\,x$ $\,26\,\,x^2\,y^2 +\,6$ $\,18\,\,y +\,6 +\,6\,\,x\,y +\,2\,\,x$ $\,6\,\,x\,y +\,6$

$(\,a+\,3)\;(\,6+\,4\,a) = $   ?

$\,22\,\,a +\,18$ $\,4\,\,a^2 +\,18$ $\,4\,\,a^2 +\,18\,\,a +\,18$ $\,5\,\,a^2 +\,14\,\,a +\,9$

$(\,5+\,x)\;(\,-6\,y+\,3) = $   ?

$\,-30\,\,y \,-15 \,-6\,\,x\,y \,-3\,\,x$ $\,-30\,\,y \,-15 +\,6\,\,x\,y +\,3\,\,x$ $\,-30\,\,y +\,15 \,-6\,\,x\,y +\,3\,\,x$ $\,30\,\,y +\,15 \,-6\,\,x\,y \,-3\,\,x$

$(\,3\,x\,-6)\;(\,5\,y\,-2) = $   ?

$\,15\,\,x\,y \,-6\,\,x \,-30\,\,y +\,12$ $\,-15\,\,x\,y \,-6\,\,x \,-30\,\,y \,-12$ $\,15\,\,x\,y \,-6\,\,x \,-30\,\,y \,-12$ $\,-15\,\,x\,y \,-6\,\,x \,-30\,\,y +\,12$

$(\,5+\,2\,b)\;(\,b\,-1) = $   ?

$\,-2\,\,b^2 \,-7\,\,b \,-5$ $\,2\,\,b^2 \,-3\,\,b \,-5$ $\,-2\,\,b^2 +\,7\,\,b \,-5$ $\,2\,\,b^2 +\,3\,\,b \,-5$

$(\,y\,-2)\;(\,-2\,-\,x) = $   ?

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

$(\,1+\,4\,y)\;(\,-3\,y\,-6) = $   ?

$\,12\,\,y^2 \,-21\,\,y \,-6$ $\,-12\,\,y^2 \,-21\,\,y +\,6$ $\,-12\,\,y^2 \,-27\,\,y \,-6$ $\,-12\,\,y^2 \,-21\,\,y \,-6$

$(\,4\,-3\,a)\;(\,-\,a\,-2) = $   ?

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