$ \,3\,\,x^2 - ( \,6 + \,7\,\,x^2 + \,6\,x)=$ ?

$\,-4\,\,x^2 +\,6\,x +\,6$ $\,10\,\,x^2 +\,6\,x +\,6$ $\,-4\,\,x^2 \,-6\,x \,-6$ $\,-4\,\,x^2 +\,6\,x \,-6$ $\,10\,\,x^2 \,-6\,x \,-6$

$ \,4\,x + \,6\,y - ( \,9\,x - \,7\,y)=$ ?

$\,-5\,x +\,13\,y$ $\,-5\,x +\,y$ $\,-5\,x \,-\,y$ $\,13\,x +\,13\,y$ $\,13\,x \,-\,y$

$ \,4\,x - \,3\,\,x^2 - ( - \,4\,\,x^2 + \,9\,x )=$ ?

$\,-7\,\,x^2 +\,13\,x$ $\,7\,\,x^2 \,-5\,x$ $\,\,x^2 \,-5\,x$ $\,-7\,\,x^2 \,-5\,x$ $\,\,x^2 +\,13\,x$

$\,1 + ( - \,5\,x + \,1) - ( \,9 - \,6\,x) =$ ?

$\,x +\,11$ $\,-7\,x +\,1$ $\,x \,-9$ $\,x \,-7$ $\,-11\,x \,-7$

$\,6\,x + (\,8 - \,8\,x + \,9\,y) =$ ?

$\,-2\,x \,-9\,y +\,8$ $\,14\,x +\,9\,y +\,8$ $\,-2\,x +\,9\,y +\,8$ $\,2\,x +\,9\,y \,-8$ $\,14\,x \,-9\,y \,-8$

$\,6\,x - ( - \,4\,\,x^2 - \,9 ) + \,8\,x=$ ?

$\,-4\,\,x^2 +\,14\,x \,-9$ $\,-4\,\,x^2 +\,14\,x +\,9$ $\,4\,\,x^2 +\,14\,x +\,9$ $\,4\,\,x^2 \,-2\,x +\,9$ $\,4\,\,x^2 +\,14\,x \,-9$