Question Factor the expression (z−1)(z+1) Evaluate z2−1Rewrite the expression in exponential form z2−12Solution (z−1)(z+1) Show Solution Find the roots z1=−1,z2=1 Evaluate z2−1To find the roots of the expression,set the expression equal to 0 z2−1=0Move the constant to the right-hand side and change its sign z2=0+1Removing 0 doesn't change the value,so remove it from the expression z2=1Take the root of both sides of the equation and remember to use both positive and negative roots z=±1Simplify the expression z=±1Separate the equation into 2 possible cases z=1z=−1Solution z1=−1,z2=1 Show Solution
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