Answer
10$x^{2}$ - 12x
Work Step by Step
(7$x^{y}$ - 11x) + (3$x^{2}$-x)
The like terms are 7$x^{2}$ and 3$x^{2}$ containing the same variable to the same power($x^{2}$), as well as -11x and -x (both containing x).
We begin by grouping these pairs of like terms.
( 7$x^{2}$ + 3$x^{2}$)+ (-11x -x)
= 10$x^{2}$ + (- 12x)
=10$x^{2}$ - 12x