-2x(x+3)-(x+1)(x-2)=


A. -X^2 - 7x -2

B. -X^2 + 5x +2

C. -3x^2 -5x +2

D. -3x^2 -5x -2

E. -3x^2 +5x -2

(I need to know how to solve it not just the answer please)