Identify binomial: Identify the binomial to be squared.The given expression is (2j+1)2, which is a binomial in the form of (a+b)2.
Apply formula: Apply the square of a binomial formula.The formula for the square of a binomial (a+b)2 is a2+2ab+b2. We will use this to expand (2j+1)2.
Identify values: Identify the values of a and b. In the expression (2j+1)2, a is 2j and b is 1.
Substitute values: Substitute the values of a and b into the formula.(2j+1)2=(2j)2+2⋅(2j)⋅1+12
Simplify expression: Simplify the expression.(2j)2+2⋅(2j)⋅1+12=4j2+4j+1
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