$\,2\;(\,-9\,a+\,1) = $   ?

$\,-18\,\,a +\,3$ $\,-7\,\,a +\,3$ $\,-18\,\,a +\,1$ $\,-18\,\,a \,-2$ $\,-18\,\,a \,-1$ $\,-18\,\,a +\,2$

$\,2\;(\,-6\,-4\,b) = $   ?

$\,-12 +\,8\,\,b$ $\,-4 \,-2\,\,b$ $\,-12 \,-8\,\,b$ $\,-12 \,-4\,b$ $\,-12 +\,4\,\,b$ $\,12 \,-2\,b$

$(\,6+\,3\,b)\,\times\,\,6\,b = $   ?

$\,-36\,\,b +\,9\,\,b^2$ $\,36\,\,b \,-18\,b$ $\,12\,\,b +\,9\,\,b^2$ $\,36\,\,b +\,18\,\,b^2$ $\,36 +\,18\,\,b^2$ $\,36\,\,b +\,3\,b$

$(\,-2\,b+\,5\,a)\,\times\,\,6\,b = $   ?

$\,-12\,\,b^2 +\,30\,\,a\,b$ $\,-12\,\,b^2 +\,5\,a$ $\,4\,\,b^2 +\,11\,\,a\,b$ $\,-12\,\,b^2 +\,11\,\,a\,b$ $\,-12\,\,b^2 \,-30\,a$ $\,12\,b +\,30\,\,a\,b$

$\,6\,b\;(\,7\,b\,-5) = $   ?

$\,42\,\,b^2 \,-5$ $\,42\,\,b^2 +\,1$ $\,42\,\,b^2 +\,30$ $\,13\,\,b^2 +\,\,b$ $\,42\,\,b^2 \,-30\,\,b$ $\,-42\,\,b^2 \,-30$

$(\,-7\,y+\,8)\,\times\,(\,-2\,x\,) = $   ?

$\,-9\,\,x\,y +\,6\,\,x$ $\,-14\,y \,-6\,\,x$ $\,14\,\,x\,y +\,16$ $\,14\,\,x\,y \,-16\,\,x$ $\,14\,y \,-16\,\,x$ $\,14\,\,x\,y +\,8$

$(\,5\,x\,-6\,y)\,\times\,\,5\,x = $   ?

$\,25\,\,x^2 \,-6\,y$ $\,10\,\,x^2 \,-\,\,x\,y$ $\,25\,\,x^2 \,-30\,\,x\,y$ $\,-25\,\,x^2 \,-\,y$ $\,25\,\,x^2 +\,30\,y$ $\,25\,x \,-30\,\,x\,y$

$\,5\;(\,3\,b+\,2\,a) = $   ?

$\,15\,\,b +\,7\,\,a$ $\,15\,\,b +\,10\,\,a$ $\,15\,\,b \,-2\,\,a$ $\,8\,\,b +\,7\,\,a$ $\,15\,\,b \,-10\,\,a$ $\,15\,\,b +\,2\,a$

$\,3\,x\;(\,7\,y+\,2) = $   ?

$\,21\,\,x\,y +\,2$ $\,21\,\,x\,y +\,6\,\,x$ $\,-21\,\,x\,y +\,6$ $\,10\,\,x\,y +\,5\,\,x$ $\,21\,\,x\,y \,-6$ $\,21\,\,x\,y +\,5\,\,x$

$\,-4\;(\,4\,-3\,y) = $   ?

$\,0 \,-7\,\,y$ $\,-16 +\,3\,\,y$ $\,16 \,-7\,y$ $\,-16 \,-3\,y$ $\,-16 +\,12\,\,y$ $\,-16 \,-12\,\,y$