$(\,a+\,6)\;(\,b+\,2) = $   ?

$\,2\,\,a\,b +\,3\,\,a +\,7\,\,b +\,8$ $\,\,a\,b +\,2\,\,a +\,6\,\,b +\,12$ $\,\,a\,b +\,12$ $\,9\,\,a^2\,b^2 +\,12$

$(\,4+\,5\,t)\;(\,t+\,6) = $   ?

$\,5\,\,t^2 +\,34\,\,t +\,24$ $\,39\,\,t +\,24$ $\,5\,\,t^2 +\,24$ $\,6\,\,t^2 +\,16\,\,t +\,10$

$(\,a+\,6)\;(\,3+\,b) = $   ?

$\,10\,\,a^2\,b^2 +\,18$ $\,4\,\,a +\,2\,\,a\,b +\,9 +\,7\,\,b$ $\,3\,\,a +\,\,a\,b +\,18 +\,6\,\,b$ $\,\,a\,b +\,18$

$(\,b+\,6)\;(\,2+\,b) = $   ?

$\,\,b^2 +\,12$ $\,2\,\,b^2 +\,10\,\,b +\,8$ $\,9\,\,b +\,12$ $\,\,b^2 +\,8\,\,b +\,12$

$(\,4\,-6\,x)\;(\,3+\,2\,y) = $   ?

$\,12 +\,8\,\,y +\,18\,\,x +\,12\,\,x\,y$ $\,12 +\,8\,\,y \,-18\,\,x \,-12\,\,x\,y$ $\,-12 +\,8\,\,y +\,18\,\,x \,-12\,\,x\,y$ $\,-12 +\,8\,\,y \,-18\,\,x +\,12\,\,x\,y$

$(\,2\,-5\,a)\;(\,6\,-3\,b) = $   ?

$\,12 +\,6\,\,b \,-30\,\,a \,-15\,\,a\,b$ $\,12 \,-6\,\,b +\,30\,\,a \,-15\,\,a\,b$ $\,12 +\,6\,\,b +\,30\,\,a +\,15\,\,a\,b$ $\,12 \,-6\,\,b \,-30\,\,a +\,15\,\,a\,b$

$(\,a\,-2)\;(\,3+\,a) = $   ?

$\,\,a^2 +\,\,a \,-6$ $\,-\,\,a^2 +\,\,a \,-6$ $\,\,a^2 +\,\,a +\,6$ $\,-\,\,a^2 \,-5\,\,a \,-6$

$(\,b\,-4)\;(\,-3\,-\,a) = $   ?

$\,-3\,\,b \,-\,\,a\,b +\,12 +\,4\,\,a$ $\,-3\,\,b \,-\,\,a\,b +\,12 \,-4\,\,a$ $\,3\,\,b \,-\,\,a\,b +\,12 +\,4\,\,a$ $\,-3\,\,b \,-\,\,a\,b \,-12 \,-4\,\,a$

$(\,4+\,y)\;(\,-\,y\,-4) = $   ?

$\,\,y^2 \,-8\,\,y +\,16$ $\,-\,\,y^2 \,-16$ $\,-\,\,y^2 +\,8\,\,y \,-16$ $\,-\,\,y^2 \,-8\,\,y \,-16$

$(\,5\,x\,-2)\;(\,-3\,-5\,x) = $   ?

$\,-25\,\,x^2 +\,25\,\,x +\,6$ $\,25\,\,x^2 \,-5\,\,x \,-6$ $\,-25\,\,x^2 \,-5\,\,x \,-6$ $\,-25\,\,x^2 \,-5\,\,x +\,6$