# How do you multiply  (sqrt2 +x)^2?

You mean expand it is $\left(\sqrt{2} + x\right) \cdot \left(\sqrt{2} + x\right) = \sqrt{2} \cdot \sqrt{2} + 2 \sqrt{2} \cdot x + {x}^{2} = {x}^{2} + 2 \sqrt{2} \cdot x + 2$