In this equation, either x = –4 or x = 3, since one of the expressions in parentheses must be equal to 0. Consider this equation: Again, since 3x2 or (x + 2) must equal 0, we know that either x = 0 or x = –2. Keep your eye out for a zero product—it’s a big time-saver, especially when you have multiple-choice answers to choose from.
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英语作文【在百度搜索更多与“ZeroProduct”相关英语作文】