OG详解-OG5 数学2 Q17

Choice B is correct. The given expression is equivalent to 8x³ +8-x³ -(-2), or 8x³ +8-x³ +2. Combining like terms in this expression yields 7x³ + 10.
Choice A is incorrect. This expression is equivalent to (8x³ +8) -2, not (8x³ +8) -(x³ -2). Choice C is incorrect. This expression is equivalent to (8x³ +8) -(-2), not (8x³ +8) -(x³ -2). Choice D is incorrect. This expression is equivalent to (8x³ +8) -(x³ +2), not (8x³ +8) -(x³ -2).