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答案：
B
Algebra Seco
So, a + 6 = 0, which means that a = –6, or a – 4 = 0, which means a = 4. The equation with the variable b has the same solutions, and so b = –6 or b = 4. Since a ≠ b, then a = –6 and b = 4, which means a + b = −6 + 4 = −2, or a = 4 and b = −6, which means that a + b = 4 + (−6) = −2
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