Attempt $2$: $19$ attempts remaining.

Find the general solution to the homogeneous differential equation.

$\frac{d^{2}y}{d{x}^2}-9y=0$

Use $c_1$ and $c_2$ in your answer to denote arbitrary constants, and enter them as $c1$ and c $2.$

$y(x)=$ help. $($formulas$)$

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