Question Simplify the expression 1−2j+j2 Evaluate (1−j)2Use (a−b)2=a2−2ab+b2 to expand the expression 12−2×1×j+j2Solution 1−2j+j2 Show Solution Find the roots j=1 Evaluate (1−j)2To find the roots of the expression,set the expression equal to 0 (1−j)2=0The only way a power can be 0 is when the base equals 0 1−j=0Move the constant to the right-hand side and change its sign −j=0−1Removing 0 doesn't change the value,so remove it from the expression −j=−1Solution j=1 Show Solution
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