Type the correct answer in each box.
Consider the expressions shown below.

Complete each of the following statements with the letter that represents the expression.
(3x^2 – 6x+ 11) - (10x^2 – 4x+ 6) is equivalent to expression
(-3x^2– 5x– 3) - (-10x^2– 7x+ 2) is equivalent to expression
(12x^2+ 6x– 5) - (5x^2 + 8x– 12) is equivalent to expression
.