SOLUTION: please help me understand Factoring and Inequalities, problem (x+1)(x+4)

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Question 565211: please help me understand Factoring and Inequalities, problem (x+1)(x+4)
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
x^2+4x+x+4=
x^2+5x+4