Question Simplify the expression z2−8z+16 Evaluate (z−4)2Use (a−b)2=a2−2ab+b2 to expand the expression z2−2z×4+42Solution z2−8z+16 Show Solution Find the roots z=4 Evaluate (z−4)2To find the roots of the expression,set the expression equal to 0 (z−4)2=0The only way a power can be 0 is when the base equals 0 z−4=0Move the constant to the right-hand side and change its sign z=0+4Solution z=4 Show Solution
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