(x+1)(x+2)+4/1
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(x+1)(x+2)+4/1
(x+1)(x+2)+4/1
(x+1)(x+2)+4/1
(x+1)((x+2)+1/4=x^2+2x+x+2+1/4
=x^2+3x+9/4
=(x+3/2)^2
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