To solve the quadratic equation \((x + 16)29 = 7\) using square roots, we first isolate the term involving \(x\).
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Divide both sides by 29: \[ x + 16 = \frac{7}{29} \]
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Subtract 16 from both sides: \[ x = \frac{7}{29} - 16 \]
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To combine the terms on the right, convert 16 to a fraction: \[ 16 = \frac{16 \times 29}{29} = \frac{464}{29} \]
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Now combine the fractions: \[ x = \frac{7}{29} - \frac{464}{29} = \frac{7 - 464}{29} = \frac{-457}{29} \]
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Calculate \(\frac{-457}{29}\): \[ -457 \div 29 \approx -15.76 \]
Therefore, the solution is: \[ x \approx -15.76 \]
Rounding to the nearest hundredth, the answer is: \[ \boxed{-15.76} \]