$(\,2+\,2\,a)\;(\,b+\,1) = $   ?

$\,6\,\,a^2\,b^2 +\,2$ $\,2\,\,a\,b +\,2$ $\,3\,\,b +\,3 +\,3\,\,a\,b +\,3\,\,a$ $\,2\,\,b +\,2 +\,2\,\,a\,b +\,2\,\,a$

$(\,4\,x+\,3)\;(\,x+\,1) = $   ?

$\,11\,\,x +\,3$ $\,4\,\,x^2 +\,3$ $\,4\,\,x^2 +\,7\,\,x +\,3$ $\,5\,\,x^2 +\,9\,\,x +\,4$

$(\,5+\,6\,b)\;(\,a+\,1) = $   ?

$\,6\,\,a\,b +\,5$ $\,17\,\,a^2\,b^2 +\,5$ $\,6\,\,a +\,6 +\,7\,\,a\,b +\,7\,\,b$ $\,5\,\,a +\,5 +\,6\,\,a\,b +\,6\,\,b$

$(\,6\,y+\,4)\;(\,4+\,2\,y) = $   ?

$\,12\,\,y^2 +\,16$ $\,8\,\,y^2 +\,16\,\,y +\,8$ $\,12\,\,y^2 +\,32\,\,y +\,16$ $\,44\,\,y +\,16$

$(\,6\,-2\,a)\;(\,1+\,5\,b) = $   ?

$\,-6 +\,30\,\,b \,-2\,\,a +\,10\,\,a\,b$ $\,6 +\,30\,\,b \,-2\,\,a \,-10\,\,a\,b$ $\,6 +\,30\,\,b +\,2\,\,a \,-10\,\,a\,b$ $\,6 +\,30\,\,b +\,2\,\,a +\,10\,\,a\,b$

$(\,4\,-6\,b)\;(\,2\,-4\,a) = $   ?

$\,8 \,-16\,\,a \,-12\,\,b \,-24\,\,a\,b$ $\,8 \,-16\,\,a \,-12\,\,b +\,24\,\,a\,b$ $\,8 +\,16\,\,a +\,12\,\,b +\,24\,\,a\,b$ $\,-8 \,-16\,\,a \,-12\,\,b +\,24\,\,a\,b$

$(\,4\,y+\,3)\;(\,y\,-2) = $   ?

$\,4\,\,y^2 +\,11\,\,y +\,6$ $\,-4\,\,y^2 +\,11\,\,y \,-6$ $\,4\,\,y^2 \,-5\,\,y +\,6$ $\,4\,\,y^2 \,-5\,\,y \,-6$

$(\,3\,-\,b)\;(\,-\,a\,-5) = $   ?

$\,3\,\,a \,-15 +\,\,a\,b +\,5\,\,b$ $\,-3\,\,a \,-15 +\,\,a\,b +\,5\,\,b$ $\,-3\,\,a \,-15 \,-\,\,a\,b +\,5\,\,b$ $\,3\,\,a \,-15 \,-\,\,a\,b +\,5\,\,b$

$(\,1\,-\,t)\;(\,-\,t+\,4) = $   ?

$\,\,t^2 \,-5\,\,t +\,4$ $\,\,t^2 \,-3\,\,t \,-4$ $\,-\,\,t^2 \,-5\,\,t +\,4$ $\,-\,\,t^2 +\,3\,\,t +\,4$

$(\,2\,-\,a)\;(\,-3\,-2\,a) = $   ?

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