$(\,2+\,x)\;(\,5+\,y) = $   ?

$\,8\,\,x^2\,y^2 +\,10$ $\,\,x\,y +\,10$ $\,7 +\,3\,\,y +\,6\,\,x +\,2\,\,x\,y$ $\,10 +\,2\,\,y +\,5\,\,x +\,\,x\,y$

$(\,y+\,5)\;(\,4\,y+\,1) = $   ?

$\,25\,\,y +\,5$ $\,4\,\,y^2 +\,5$ $\,4\,\,y^2 +\,21\,\,y +\,5$ $\,5\,\,y^2 +\,11\,\,y +\,6$

$(\,3\,t+\,4)\;(\,4+\,3\,x) = $   ?

$\,7\,\,t +\,6\,\,t\,x +\,8 +\,7\,\,x$ $\,33\,\,t^2\,x^2 +\,16$ $\,12\,\,t +\,9\,\,t\,x +\,16 +\,12\,\,x$ $\,9\,\,t\,x +\,16$

$(\,6+\,2\,y)\;(\,3+\,5\,y) = $   ?

$\,7\,\,y^2 +\,16\,\,y +\,9$ $\,46\,\,y +\,18$ $\,10\,\,y^2 +\,36\,\,y +\,18$ $\,10\,\,y^2 +\,18$

$(\,1\,-2\,a)\;(\,5+\,b) = $   ?

$\,5 \,-\,\,b +\,10\,\,a \,-2\,\,a\,b$ $\,-5 +\,\,b +\,10\,\,a \,-2\,\,a\,b$ $\,5 +\,\,b +\,10\,\,a \,-2\,\,a\,b$ $\,5 +\,\,b \,-10\,\,a \,-2\,\,a\,b$

$(\,x\,-2)\;(\,-5+\,4\,y) = $   ?

$\,-5\,\,x +\,4\,\,x\,y +\,10 \,-8\,\,y$ $\,5\,\,x +\,4\,\,x\,y +\,10 \,-8\,\,y$ $\,5\,\,x \,-4\,\,x\,y +\,10 \,-8\,\,y$ $\,-5\,\,x +\,4\,\,x\,y \,-10 \,-8\,\,y$

$(\,3\,-\,b)\;(\,b+\,3) = $   ?

$\,-\,\,b^2 +\,9$ $\,\,b^2 \,-6\,\,b +\,9$ $\,-\,\,b^2 +\,9$ $\,\,b^2 +\,9$

$(\,t\,-1)\;(\,-6\,-3\,x) = $   ?

$\,-6\,\,t \,-3\,\,t\,x \,-6 \,-3\,\,x$ $\,6\,\,t +\,3\,\,t\,x +\,6 +\,3\,\,x$ $\,6\,\,t \,-3\,\,t\,x +\,6 +\,3\,\,x$ $\,-6\,\,t \,-3\,\,t\,x +\,6 +\,3\,\,x$

$(\,4\,a\,-3)\;(\,1\,-\,a) = $   ?

$\,-4\,\,a^2 +\,7\,\,a +\,3$ $\,-4\,\,a^2 +\,7\,\,a \,-3$ $\,-4\,\,a^2 +\,\,a +\,3$ $\,-4\,\,a^2 \,-\,\,a +\,3$

$(\,2\,-\,a)\;(\,-\,a\,-3) = $   ?

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