$(\,2+\,b)\;(\,a+\,5) = $   ?

$\,8\,\,a^2\,b^2 +\,10$ $\,3\,\,a +\,7 +\,2\,\,a\,b +\,6\,\,b$ $\,2\,\,a +\,10 +\,\,a\,b +\,5\,\,b$ $\,\,a\,b +\,10$

$(\,3+\,y)\;(\,y+\,3) = $   ?

$\,\,y^2 +\,9$ $\,\,y^2 +\,6\,\,y +\,9$ $\,2\,\,y^2 +\,8\,\,y +\,6$ $\,7\,\,y +\,9$

$(\,1+\,4\,x)\;(\,2+\,y) = $   ?

$\,3 +\,2\,\,y +\,6\,\,x +\,5\,\,x\,y$ $\,2 +\,\,y +\,8\,\,x +\,4\,\,x\,y$ $\,4\,\,x\,y +\,2$ $\,13\,\,x^2\,y^2 +\,2$

$(\,b+\,2)\;(\,1+\,3\,b) = $   ?

$\,3\,\,b^2 +\,2$ $\,4\,\,b^2 +\,7\,\,b +\,3$ $\,10\,\,b +\,2$ $\,3\,\,b^2 +\,7\,\,b +\,2$

$(\,2+\,6\,t)\;(\,-4\,x+\,1) = $   ?

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

$(\,b+\,2)\;(\,-2\,a\,-5) = $   ?

$\,-2\,\,a\,b \,-5\,\,b \,-4\,\,a \,-10$ $\,-2\,\,a\,b +\,5\,\,b \,-4\,\,a +\,10$ $\,-2\,\,a\,b +\,5\,\,b +\,4\,\,a \,-10$ $\,2\,\,a\,b +\,5\,\,b \,-4\,\,a \,-10$

$(\,1+\,b)\;(\,2\,b\,-6) = $   ?

$\,2\,\,b^2 +\,4\,\,b \,-6$ $\,2\,\,b^2 \,-4\,\,b \,-6$ $\,2\,\,b^2 +\,8\,\,b \,-6$ $\,-2\,\,b^2 \,-8\,\,b \,-6$

$(\,t\,-2)\;(\,-5\,-\,x) = $   ?

$\,-5\,\,t +\,\,t\,x \,-10 +\,2\,\,x$ $\,-5\,\,t \,-\,\,t\,x +\,10 +\,2\,\,x$ $\,5\,\,t \,-\,\,t\,x \,-10 +\,2\,\,x$ $\,5\,\,t \,-\,\,t\,x +\,10 \,-2\,\,x$

$(\,3\,y+\,5)\;(\,-6\,y\,-3) = $   ?

$\,-18\,\,y^2 +\,21\,\,y \,-15$ $\,-18\,\,y^2 +\,39\,\,y \,-15$ $\,-18\,\,y^2 \,-21\,\,y +\,15$ $\,-18\,\,y^2 \,-39\,\,y \,-15$

$(\,6\,-\,b)\;(\,-5\,-2\,b) = $   ?

$\,2\,\,b^2 \,-7\,\,b \,-30$ $\,-2\,\,b^2 +\,17\,\,b \,-30$ $\,2\,\,b^2 +\,17\,\,b \,-30$ $\,-2\,\,b^2 \,-7\,\,b \,-30$