We are given the following:
![-4x^2-x+10-x^2+10x](https://img.qammunity.org/2023/formulas/mathematics/high-school/gn7r53poepjyum0l6xfvzi3ylzjq1h8g1r.png)
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1. Group the like terms.
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2. Add similar elements (
).
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3. Add similar elements (
).
![-5x^2+9x+10](https://img.qammunity.org/2023/formulas/mathematics/high-school/z0mtu2vaix6knrzxtsfss1czsya077wibp.png)
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Hope this helps!