$(\,3+\,a)\;(\,2+\,3\,b) = $   ?

$\,5 +\,6\,\,b +\,3\,\,a +\,4\,\,a\,b$ $\,14\,\,a^2\,b^2 +\,6$ $\,3\,\,a\,b +\,6$ $\,6 +\,9\,\,b +\,2\,\,a +\,3\,\,a\,b$

$(\,4+\,y)\;(\,1+\,4\,y) = $   ?

$\,4\,\,y^2 +\,17\,\,y +\,4$ $\,4\,\,y^2 +\,4$ $\,21\,\,y +\,4$ $\,5\,\,y^2 +\,10\,\,y +\,5$

$(\,2+\,4\,a)\;(\,5+\,b) = $   ?

$\,26\,\,a^2\,b^2 +\,10$ $\,7 +\,3\,\,b +\,9\,\,a +\,5\,\,a\,b$ $\,10 +\,2\,\,b +\,20\,\,a +\,4\,\,a\,b$ $\,4\,\,a\,b +\,10$

$(\,3\,y+\,5)\;(\,y+\,3) = $   ?

$\,3\,\,y^2 +\,14\,\,y +\,15$ $\,3\,\,y^2 +\,15$ $\,17\,\,y +\,15$ $\,4\,\,y^2 +\,12\,\,y +\,8$

$(\,4+\,5\,t)\;(\,-2\,x+\,3) = $   ?

$\,8\,\,x \,-12 \,-10\,\,t\,x +\,15\,\,t$ $\,8\,\,x +\,12 \,-10\,\,t\,x +\,15\,\,t$ $\,-8\,\,x +\,12 \,-10\,\,t\,x +\,15\,\,t$ $\,8\,\,x +\,12 +\,10\,\,t\,x +\,15\,\,t$

$(\,3\,y\,-1)\;(\,1\,-\,x) = $   ?

$\,3\,\,y \,-3\,\,x\,y \,-1 +\,\,x$ $\,3\,\,y +\,3\,\,x\,y \,-1 +\,\,x$ $\,3\,\,y \,-3\,\,x\,y +\,1 +\,\,x$ $\,-3\,\,y \,-3\,\,x\,y +\,1 +\,\,x$

$(\,5\,-\,a)\;(\,4+\,5\,a) = $   ?

$\,-5\,\,a^2 +\,29\,\,a \,-20$ $\,-5\,\,a^2 +\,21\,\,a +\,20$ $\,-5\,\,a^2 \,-21\,\,a +\,20$ $\,-5\,\,a^2 \,-29\,\,a \,-20$

$(\,2\,-3\,y)\;(\,-6\,-\,x) = $   ?

$\,12 \,-2\,\,x +\,18\,\,y +\,3\,\,x\,y$ $\,-12 +\,2\,\,x +\,18\,\,y \,-3\,\,x\,y$ $\,-12 \,-2\,\,x +\,18\,\,y +\,3\,\,x\,y$ $\,-12 \,-2\,\,x \,-18\,\,y +\,3\,\,x\,y$

$(\,1\,-\,a)\;(\,-3\,a+\,1) = $   ?

$\,-3\,\,a^2 \,-4\,\,a +\,1$ $\,-3\,\,a^2 +\,2\,\,a +\,1$ $\,3\,\,a^2 \,-4\,\,a +\,1$ $\,3\,\,a^2 \,-4\,\,a \,-1$

$(\,2\,-\,a)\;(\,-6\,-4\,a) = $   ?

$\,4\,\,a^2 \,-14\,\,a +\,12$ $\,4\,\,a^2 +\,14\,\,a +\,12$ $\,-4\,\,a^2 \,-14\,\,a \,-12$ $\,4\,\,a^2 \,-2\,\,a \,-12$