Should the energy required to break one of the HF bonds in HF 2 (HF 2

Question:

Should the energy required to break one of the H—F bonds in HF₂⁻ (HF₂⁻ → HF + F⁻) be greater than, less than, or the same as the energy required to break the bond in HF (HF→ H⁺ F). Explain your answer, considering the 3-center-4-electron bond model for HF₂⁻ described in A Closer Look: Three-Center Bonds in HF₂⁻, B₂H₆, and SF₆.