To solve the quadratic equation \((x−18)^2=196\) using square roots, we follow these steps:
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Take the square root of both sides: \[ x - 18 = \pm 14 \]
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Solve for \(x\) for both cases:
Case 1: \[ x - 18 = 14 \] \[ x = 14 + 18 = 32 \]
Case 2: \[ x - 18 = -14 \] \[ x = -14 + 18 = 4 \]
So, the solutions are \(x = 32\) and \(x = 4\).
Thus, the correct response is: {32, 4}.