Answer:
C. -x^2-x+9
Step-by-step explanation:
Combine Like Terms:
what we have 2x^2+6x−7x+8−3x^2+1
=(2x^2−3x^2)+(6x+−7x)+(8+1)
=−x^2+−x+9
Add 8 + 1
Combine like terms
v
45
Step-by-step explanation
20x = 900
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20 20