$(\,1+\,y)\;(\,4\,x+\,6) = $   ?

$\,4\,\,x\,y +\,6$ $\,5\,\,x +\,7 +\,5\,\,x\,y +\,7\,\,y$ $\,14\,\,x^2\,y^2 +\,6$ $\,4\,\,x +\,6 +\,4\,\,x\,y +\,6\,\,y$

$(\,6\,t+\,2)\;(\,2+\,4\,t) = $   ?

$\,44\,\,t +\,4$ $\,24\,\,t^2 +\,4$ $\,24\,\,t^2 +\,20\,\,t +\,4$ $\,10\,\,t^2 +\,14\,\,t +\,4$

$(\,2+\,3\,a)\;(\,b+\,2) = $   ?

$\,2\,\,b +\,4 +\,3\,\,a\,b +\,6\,\,a$ $\,11\,\,a^2\,b^2 +\,4$ $\,3\,\,b +\,4 +\,4\,\,a\,b +\,5\,\,a$ $\,3\,\,a\,b +\,4$

$(\,a+\,1)\;(\,6+\,5\,a) = $   ?

$\,5\,\,a^2 +\,11\,\,a +\,6$ $\,5\,\,a^2 +\,6$ $\,6\,\,a^2 +\,13\,\,a +\,7$ $\,16\,\,a +\,6$

$(\,5\,y\,-2)\;(\,x+\,5) = $   ?

$\,-5\,\,x\,y +\,25\,\,y \,-2\,\,x \,-10$ $\,5\,\,x\,y +\,25\,\,y +\,2\,\,x +\,10$ $\,-5\,\,x\,y \,-25\,\,y \,-2\,\,x \,-10$ $\,5\,\,x\,y +\,25\,\,y \,-2\,\,x \,-10$

$(\,3\,-2\,a)\;(\,-2+\,3\,b) = $   ?

$\,-6 \,-9\,\,b +\,4\,\,a +\,6\,\,a\,b$ $\,-6 +\,9\,\,b \,-4\,\,a \,-6\,\,a\,b$ $\,-6 +\,9\,\,b +\,4\,\,a \,-6\,\,a\,b$ $\,-6 \,-9\,\,b \,-4\,\,a \,-6\,\,a\,b$

$(\,3\,x\,-6)\;(\,x+\,2) = $   ?

$\,3\,\,x^2 \,-12$ $\,-3\,\,x^2 \,-12$ $\,-3\,\,x^2 +\,12\,\,x \,-12$ $\,3\,\,x^2 +\,12$

$(\,2\,x\,-2)\;(\,-4\,y\,-1) = $   ?

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

$(\,6+\,x)\;(\,-\,x\,-2) = $   ?

$\,\,x^2 +\,4\,\,x \,-12$ $\,-\,\,x^2 +\,8\,\,x \,-12$ $\,\,x^2 \,-4\,\,x \,-12$ $\,-\,\,x^2 \,-8\,\,x \,-12$

$(\,a\,-1)\;(\,-2\,-5\,a) = $   ?

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