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5. Find the value of the variable for equal roots

If the following equations have two equal roots, then find the value of '\(a\)'.

1. \(x^2 + ax + 9 = 0\)

\(a = 6\) or \(a = -6\)
\(a = 4\) or \(a = -4\)
\(a = 16\) or \(a = -16\)
\(a = \sqrt{6}\) or \(a = -\sqrt{6}\)

2. \(9x^2 + ax + 2 = 0\)

\(a = 3 \sqrt{4}\) or \(a = -3 \sqrt{4}\)
\(a = 2 \sqrt{6}\) or \(a = -2 \sqrt{6}\)
\(a = 4 \sqrt{3}\) or \(a = -4 \sqrt{3}\)
\(a = 6 \sqrt{2}\) or \(a = -6 \sqrt{2}\)

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