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

  

RELATED QUESTIONS

-2+5x-7=3x-9+2x (answered by ikleyn)

Subtract 2x^2+5x-6 from... (answered by ikleyn)

2x^2-5x=9 (answered by richwmiller)

2x^2 - 5x >... (answered by JimboP1977)

5X^2-2x=7 (answered by jorel1380)

12(3x^2-2x+5)=7(5x^2-3x+10) (answered by Fombitz)

(2x 2 + 3x – 9) – (- 4x +... (answered by ewatrrr)

(7x^2+3x+9)+(2x^2+5x-2) (answered by funmath)

-2x^4-3x^2+5x-9  when... (answered by jim_thompson5910)