To solve the quadratic equation \((x + 36)^2 - 38 = 251\) using square roots, we first isolate the squared term:
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Add 38 to both sides: \[ (x + 36)^2 = 251 + 38 \] \[ (x + 36)^2 = 289 \]
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Take the square root of both sides: \[ x + 36 = \pm \sqrt{289} \] \[ x + 36 = \pm 17 \]
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Solve for \(x\) by subtracting 36 from both sides.
For the positive square root: \[ x + 36 = 17 \] \[ x = 17 - 36 \] \[ x = -19 \]
For the negative square root: \[ x + 36 = -17 \] \[ x = -17 - 36 \] \[ x = -53 \]
Thus, the solutions to the equation are: \[ { -19, -53 } \]
So the answer is \({ -19, -53 }\).