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Re: a b [#permalink]
Hi. Sorry if I'm missing something here, but can't we multiply both sides by b-a so that Quantity A= a-b and Quantity B= b-a, then add A to both sides, then add B to both sides, divide by 2, so we have 'a' in Quantity A and 'b' in Quantity B and plug in values to prove D?
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Re: a b [#permalink]
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PTMBA23 wrote:
Hi. Sorry if I'm missing something here, but can't we multiply both sides by b-a so that Quantity A= a-b and Quantity B= b-a, then add A to both sides, then add B to both sides, divide by 2, so we have 'a' in Quantity A and 'b' in Quantity B and plug in values to prove D?


Be careful. We can't multiply both quantities by (b-a), since we don't know whether (b-a) is positive or negative.

For more on this watch the following video, starting at 2:35
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Re: a b [#permalink]
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