It looks like you need help with solving a quadratic equation by completing the square. However, the equation you provided, "f18f1 = 0 3," is unclear. Could you clarify the quadratic equation you want me to solve?

Here’s an example of solving by completing the square in case this helps you get started:

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Example: Solve $x^2 + 6x - 7 = 0$ by completing the square.

1. Move the constant term to the other side:

   $x^2 + 6x = 7$

2. Find half of the coefficient of $x$ (which is 6) and square it:

   $\left(\frac{6}{2}\right)^2 = 9$

3. Add 9 to both sides to complete the square:

   [ x^2 + 6x + 9 = 7 + 9