The roots of the quadratic equation $(x - 1)^2 = 16$ are :

Question

Accepted Answer

Step 1: Take square root on both sides.
$$(x-1)^2 = 16 \Rightarrow x-1 = \pm 4$$
Step 2: Solve both cases.
$$x - 1 = 4 \Rightarrow x = 5$$
$$x - 1 = -4 \Rightarrow x = -3$$
Step 3: Hence the roots are $5$ and $-3$.

Correct option : (C)

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