Solution
For this case we have the following expression:
A.11x^2 +6x-6
B.7x^2 +16x+25
C. 11x^2 -5x+13
D. 7x^2 -3x+8
Then the correct solution :
x^2 +15x +65 +(2x-5)(3x+8)= x^2 +15x +65 +6x^2 +16x -15x -40= 7x^2 +16x +25 (B)
(4x+1)(3x-4) -(5x^2-10x-12)= 12x^2 -16x +3x -4 -5x^2 +10x +12 = 7x^2 -3x +8 (D)
8x^2 +19x+4 + (3x+2)(x-5)= 8x^2 +19x +4 +3x^2-15x +2x -10= 11x^2 +6x -6 (A)
(6x+1)(3x-7) -(7x^2-34x-20)= 18x^2-42x +3x -7 -7x^2 +34x +20= 11x^2 -5x +13 (C)