(3x2 – 7x – 4) – (6x2 – 6x + 1)
A. –3x2 – x –5
B. –3x2 –13x + 5
C. 9x2 – x + 5
D. 3x2 – 13x – 5
(3x2 – 7x – 4) – (6x2 – 6x + 1)
= 3x2 – 7x – 4 – 6x2 + 6x – 1 (distributing negative sign)
= (3x2 – 6x2) + (-7x + 6x) – (4 + 1) (grouping like terms)
= -3x2 - x - 5
Therefore, the answer is A, –3x2 – x – 5.