Q7: If x(x - 5)(x + 2) = 0, is x negative? (1) x2 – 7x ≠ 0 (2) x2 –2x –15 ≠ 0 A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. D. EACH statement ALONE is sufficient. E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer: C 不太明白，但似乎觉得怎么化减一下就可以得出结论了，脑子慢了，指教一下吧 | 
