Question Simplify the expression z2−2z+1 Evaluate (z−1)2Use (a−b)2=a2−2ab+b2 to expand the expression z2−2z×1+12Solution z2−2z+1 Show Solution Find the roots z=1 Evaluate (z−1)2To find the roots of the expression,set the expression equal to 0 (z−1)2=0The only way a power can be 0 is when the base equals 0 z−1=0Move the constant to the right-hand side and change its sign z=0+1Solution z=1 Show Solution
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