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In this paper, we show that if b ∈ L 2 ⁢ (ℝ n) {b\in L^{2}(\mathbb{R}^{n})} , then the bilinear form defined on the product of the non-homogeneous Sobolev spaces H s 2 ⁢ (ℝ n) × H s 2 ⁢ (ℝ n) {H_{s}^{2}(\mathbb{R}^{n})\times H_{s}^{2}(\mathbb{R}^{n})} , 0 < s < 1 {0