Question 427629
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Hi
3x^2 -2x + 7 from 2x^2 +5x - 9    |Note the use of ^ (uppercase 6)
If I am understanding Your question properly
2x^2 +5x -9  -1*(3x^2 -2x + 7)   |removing parenthesis 
2x^2 +5x - 9 -3x^2 +2x - 7       |combining 'Like' terms     
 -x^2 + 7x - 16