$(\,2\,a+\,2)\;(\,b+\,6) = $   ?

$\,16\,\,a^2\,b^2 +\,12$ $\,2\,\,a\,b +\,12$ $\,3\,\,a\,b +\,8\,\,a +\,3\,\,b +\,8$ $\,2\,\,a\,b +\,12\,\,a +\,2\,\,b +\,12$

$(\,2+\,a)\;(\,3+\,4\,a) = $   ?

$\,5\,\,a^2 +\,10\,\,a +\,5$ $\,15\,\,a +\,6$ $\,4\,\,a^2 +\,11\,\,a +\,6$ $\,4\,\,a^2 +\,6$

$(\,1+\,4\,y)\;(\,3\,x+\,2) = $   ?

$\,3\,\,x +\,2 +\,12\,\,x\,y +\,8\,\,y$ $\,12\,\,x\,y +\,2$ $\,23\,\,x^2\,y^2 +\,2$ $\,4\,\,x +\,3 +\,7\,\,x\,y +\,6\,\,y$

$(\,3+\,2\,a)\;(\,a+\,3) = $   ?

$\,11\,\,a +\,9$ $\,2\,\,a^2 +\,9\,\,a +\,9$ $\,3\,\,a^2 +\,9\,\,a +\,6$ $\,2\,\,a^2 +\,9$

$(\,2\,t\,-2)\;(\,5+\,x) = $   ?

$\,10\,\,t +\,2\,\,t\,x \,-10 \,-2\,\,x$ $\,10\,\,t +\,2\,\,t\,x \,-10 +\,2\,\,x$ $\,10\,\,t \,-2\,\,t\,x \,-10 +\,2\,\,x$ $\,10\,\,t \,-2\,\,t\,x \,-10 \,-2\,\,x$

$(\,4\,-\,x)\;(\,-2\,y+\,6) = $   ?

$\,-8\,\,y +\,24 +\,2\,\,x\,y \,-6\,\,x$ $\,8\,\,y +\,24 +\,2\,\,x\,y +\,6\,\,x$ $\,8\,\,y +\,24 +\,2\,\,x\,y \,-6\,\,x$ $\,-8\,\,y \,-24 +\,2\,\,x\,y +\,6\,\,x$

$(\,5\,b+\,6)\;(\,-\,b+\,4) = $   ?

$\,-5\,\,b^2 +\,26\,\,b +\,24$ $\,-5\,\,b^2 \,-26\,\,b \,-24$ $\,5\,\,b^2 +\,14\,\,b \,-24$ $\,-5\,\,b^2 +\,14\,\,b +\,24$

$(\,5\,-\,x)\;(\,-3\,y\,-4) = $   ?

$\,-15\,\,y +\,20 +\,3\,\,x\,y +\,4\,\,x$ $\,-15\,\,y \,-20 \,-3\,\,x\,y \,-4\,\,x$ $\,-15\,\,y \,-20 +\,3\,\,x\,y +\,4\,\,x$ $\,-15\,\,y +\,20 +\,3\,\,x\,y \,-4\,\,x$

$(\,x\,-6)\;(\,-3+\,2\,x) = $   ?

$\,-2\,\,x^2 \,-9\,\,x +\,18$ $\,2\,\,x^2 \,-15\,\,x +\,18$ $\,2\,\,x^2 \,-9\,\,x +\,18$ $\,2\,\,x^2 +\,9\,\,x \,-18$

$(\,4\,-3\,b)\;(\,-5\,-\,b) = $   ?

$\,3\,\,b^2 \,-19\,\,b +\,20$ $\,-3\,\,b^2 +\,19\,\,b \,-20$ $\,3\,\,b^2 +\,11\,\,b +\,20$ $\,3\,\,b^2 +\,11\,\,b \,-20$