Posted by **carol** on Wednesday, May 4, 2011 at 4:02pm.

In solving the equation (x + 4)(x – 7) = -18, Eric stated that the solution would be

x + 4 = -18 => x = -22

or

(x – 7) = -18 => x = -11

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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