Answer :
[tex] 2x^{2} - 5x + 25 - (4 x^{2} - 17x + 36)
= 2x^{2} - 5x + 25 -4 x^{2} +17x -36
= (2-4) x^{2} + (-5+17)x + 25 - 36
= -2 x^{2} + 12x - 11[/tex]
[tex]2x^2-5x+25-(4x^2-17x+36)=\\
2x^2-5x+25-4x^2+17x-36=\\
-2x^2+12x-11[/tex]