To solve the equation \(4a^2 + 64 = 0\), we can start by isolating \(a^2\).
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Subtract 64 from both sides: \[ 4a^2 = -64 \]
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Divide both sides by 4: \[ a^2 = -16 \]
Next, to find the values of \(a\), we take the square root of both sides. However, since we are taking the square root of a negative number, we will get complex solutions:
- Taking the square root: \[ a = \pm \sqrt{-16} \]
Using the property that \(\sqrt{-1} = i\), we can rewrite the equation: \[ a = \pm 4i \]
Thus, the solutions are: \[ a = 4i, -4i \]
So, the correct choice is:
A. \(a = 4i, -4i\) (Simplified answer: \(4i, -4i\))