Identify Formula: Identify the expression to be squared and the special case formula to use.The expression given is (a−1)2, which is in the form of (a−b)2.Special case: (a−b)2=a2−2ab+b2
Identify Values: Identify the values of a and b in the expression.In the expression (a−1)2, we compare it to (a−b)2 to find:a=ab=1
Apply Formula: Apply the square of a binomial formula to expand (a−1)2.Using the formula (a−b)2=a2−2ab+b2, we get:(a−1)2=a2−2(a)(1)+12
Simplify Expression: Simplify the expanded expression.a2−2(a)(1)+12= a2−2a+1
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