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For this product to be zero, since ab≠ we can have: a=-b OR a= b
Let's look at the options: 1. DOES NOT HAVE TO BE TRUE. Take a = 1, b = -1, for instance 2. DOES NOT HAVE TO BE TRUE. Take a = 1, b = 1, for instance 3. DOES NOT HAVE TO BE TRUE. Take a = 2, b = 2, for instance
Re: If ab ≠ 0 and a^3b = ab^3, then which option must be true ? [#permalink]
01 Nov 2014, 21:11
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