=>
[tex] = > 3 {a}^{2} \sqrt{3} = 36 \times 2 \\3 {a}^{2} \sqrt{3} = 72 \\ = > 3 {a}^{2} = \frac{72}{ \sqrt{3} } \: \: - rationalizam \\ = > 3 {a}^{2} = \frac{72 \sqrt{3} }{3} = 24 \sqrt{3} \\ = > {a}^{2} = 8 \sqrt{3} \\ = > a = \sqrt{8 \sqrt{3} } = 2 \: \: {}^{4} \sqrt{12} [/tex]
