Identify Binomial & Formula: Identify the binomial to be squared and the special case formula.The given expression is (3n+1)2, which is a binomial squared. The special case formula for the square of a binomial (a+b)2 is a2+2ab+b2.
Identify a and b: Identify the values of a and b in the binomial.In the expression (3n+1)2, a is 3n and b is 1.
Apply Binomial Formula: Apply the square of a binomial formula to expand (3n+1)2. Using the formula (a+b)2=a2+2ab+b2, we get: (3n+1)2=(3n)2+2⋅(3n)⋅1+12
Simplify Expanded Expression: Simplify the expanded expression.(3n)2+2⋅(3n)⋅1+12=9n2+6n+1
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