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Answer:
She didn't changed the signs for last two terms
Step-by-step explanation:
Since there is a -ve sign in front of the 2nd prentheses, all the signs will change
therefore
[tex]8x {}^{2} + 2x - 6 - 5x {}^{2} + 3x - 2 \\ 3x {}^{2} + 5x - 8[/tex]