$(\,b+\,2)\;(\,3\,a+\,5) = $   ?

$\,3\,\,a\,b +\,5\,\,b +\,6\,\,a +\,10$ $\,3\,\,a\,b +\,10$ $\,14\,\,a^2\,b^2 +\,10$ $\,4\,\,a\,b +\,6\,\,b +\,5\,\,a +\,7$

$(\,4\,a+\,1)\;(\,5\,a+\,3) = $   ?

$\,20\,\,a^2 +\,3$ $\,37\,\,a +\,3$ $\,9\,\,a^2 +\,13\,\,a +\,4$ $\,20\,\,a^2 +\,17\,\,a +\,3$

$(\,1+\,t)\;(\,x+\,4) = $   ?

$\,\,t\,x +\,4$ $\,6\,\,t^2\,x^2 +\,4$ $\,\,x +\,4 +\,\,t\,x +\,4\,\,t$ $\,2\,\,x +\,5 +\,2\,\,t\,x +\,5\,\,t$

$(\,2\,y+\,2)\;(\,5\,y+\,1) = $   ?

$\,7\,\,y^2 +\,10\,\,y +\,3$ $\,22\,\,y +\,2$ $\,10\,\,y^2 +\,12\,\,y +\,2$ $\,10\,\,y^2 +\,2$

$(\,1\,-6\,b)\;(\,a+\,1) = $   ?

$\,-\,\,a +\,1 \,-6\,\,a\,b +\,6\,\,b$ $\,\,a +\,1 +\,6\,\,a\,b +\,6\,\,b$ $\,-\,\,a \,-1 \,-6\,\,a\,b \,-6\,\,b$ $\,\,a +\,1 \,-6\,\,a\,b \,-6\,\,b$

$(\,y\,-3)\;(\,2\,-4\,x) = $   ?

$\,2\,\,y \,-4\,\,x\,y +\,6 +\,12\,\,x$ $\,2\,\,y \,-4\,\,x\,y \,-6 +\,12\,\,x$ $\,2\,\,y \,-4\,\,x\,y \,-6 \,-12\,\,x$ $\,-2\,\,y \,-4\,\,x\,y +\,6 +\,12\,\,x$

$(\,t+\,3)\;(\,-1+\,t) = $   ?

$\,\,t^2 +\,2\,\,t +\,3$ $\,\,t^2 +\,2\,\,t \,-3$ $\,\,t^2 \,-4\,\,t \,-3$ $\,-\,\,t^2 +\,4\,\,t \,-3$

$(\,4\,y\,-4)\;(\,-1\,-5\,x) = $   ?

$\,-4\,\,y +\,20\,\,x\,y +\,4 +\,20\,\,x$ $\,-4\,\,y \,-20\,\,x\,y +\,4 +\,20\,\,x$ $\,-4\,\,y +\,20\,\,x\,y +\,4 \,-20\,\,x$ $\,4\,\,y +\,20\,\,x\,y +\,4 +\,20\,\,x$

$(\,4\,y\,-2)\;(\,1\,-3\,y) = $   ?

$\,12\,\,y^2 +\,2\,\,y \,-2$ $\,12\,\,y^2 +\,10\,\,y \,-2$ $\,-12\,\,y^2 +\,10\,\,y \,-2$ $\,-12\,\,y^2 \,-10\,\,y \,-2$

$(\,5\,-\,x)\;(\,-4\,x\,-6) = $   ?

$\,4\,\,x^2 \,-14\,\,x +\,30$ $\,4\,\,x^2 \,-14\,\,x \,-30$ $\,-4\,\,x^2 \,-26\,\,x \,-30$ $\,4\,\,x^2 +\,26\,\,x +\,30$