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April 20, 2014

Homework Help: Math

Posted by Angelina on Monday, August 22, 2011 at 9:03am.

I don't understand how to solve this problem:

In solving the equation (x + 3)(x + 1) = 48, Eric stated that the solution would be
x + 3 = 48 => x = 45or (x + 1) = 48 => x = 47 However, at least one of these solutions fails to work when substituted back into the original equation. Why is that? Please help Eric to understand better; solve the problem yourself, and explain your reasoning.

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