Answers A, C, B in order
Step by step
When you subtract like terms, you change the signs on the second expression and add the coefficients
(3x^2 - 6x + 11) - (10x^2 -4x + 6)
(3x^2 - 6x + 11)
(-10x^2 +4x -6)
A = -7x^2 -2x +5
_______________
(-3x^2 -5x -3 ) - (-10x^2 -7x + 2)
(-3x^2 -5x -3 )
(10x^2 +7x - 2)
C = 7x^2 +2x -5
______________
(12x^2 + 6x -5) - ( 5x^2 +8x -12)
(12x^2 + 6x -5)
( -5x^2 -8x + 12)
B = 7x^2 -2x +7