



 
Hi Vincent, The polynomial P(1 + r/2)^{2} is equivalent to P(1 + r/2)(1+r/2) . Sometimes students have a hard time distributing factors that contain fractions. For this situation I suggest substituting the fractional term with a variable then substitute back: Let c = r/2 P(1+c)(1+c) = P(1+c+c+c^{2})= P(1+2c+c^{2})=P+2Pc+Pc^{2}=P+2P(r/2)+P(r/2)^{2} = P+Pr+Pr^{2}/4 Now you can substitute P=200 and r=0.10 into your bracketfree polynomial. Hope this helps, Janice  


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