Answer:
-14x² +19x
Explanation:
You want the sum of the expressions (-8x² +9x) and (-6x² +10x).
Simplification
The sum is found by adding like terms: terms with the variable to the same power.
(-8x² +9x) + (-6x² +10x)
= (-8 -6)x² +(9 +10)x
= -14x² +19x