Which polynomial represents the sum: (14x^2-14)+(-10x^2-10x+10)?

$4 {x}^{2} - 10 x - 4$
Note that I have used the place keeper of $0 x$ in the second line. This represents that there are not any $x$ terms
$- 10 {x}^{2} - 10 x + 10$
$\underline{\textcolor{w h i t e}{. .} 14 {x}^{2} + \textcolor{w h i t e}{1} 0 x - 14} \leftarrow \text{ Add}$
$\text{ } \textcolor{w h i t e}{.} 4 {x}^{2} - 10 x - 4$