Final answer:
To simplify the given expression, combine like terms. The simplified expression is -x² + 5x.
Step-by-step explanation:
The given expression is: 7x² – 5x + 10x – 8x².
To simplify the expression, we can combine like terms, which means adding or subtracting the coefficients of the same variable.
In this case, we have 7x² and -8x², which are like terms, and their sum is -1x² or -x². Then we have -5x and 10x, which are like terms, and their sum is 5x.
So the simplified expression is: -x² + 5x.