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OpenStudy (quickstudent):
Is this simplified correctly? (x^3 - 3x^2 + 2x) - (x^2 - 9) x^3 - 3x^2 + 2x - x^2 + 9 x^3 - 3x^2 - x^2 + 2x - 9 x^3 - 2x^2 + 2x - 9
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OpenStudy (anonymous):
No
OpenStudy (quickstudent):
What is wrong in it?
OpenStudy (anonymous):
- 3x^2 - x^2 = -4x^2
OpenStudy (anonymous):
Then, why did you change the sign of 9 twice ?
OpenStudy (quickstudent):
I think I made a mistake when I typed it in.
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OpenStudy (quickstudent):
Let me see my original...
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