jawab nomor 38-40 jawab dengan benar lengkap jelas dan beserta caranya

38.
[tex]d = \sqrt{ ( 4\sqrt{3})^{2}+ (2 \sqrt{3})^{2}} \\ \sqrt{ ( 48 + 12)} \\ \sqrt{ (60)} \\ 2 \sqrt{15} [/tex]

39. 
[tex] \sqrt{a^{2} - a +3 } = a - 6 \\ (\sqrt{a^{2} - a +3 })^2 = (a - 6)^2 \\ a^{2} - a +3 = a^{2}-12a +36 \\ a^{2}-a^{2}+12a - a = 36 - 3 \\ 11a = 33 \\ a = 3 [/tex]

40.
[tex] \frac{8}{ \sqrt{5}+3 } \\ \frac{8}{ \sqrt{5}+3 } . \frac{\sqrt{5}-3}{\sqrt{5}-3} \\ \frac{8(\sqrt{5}-3)}{5-9} \\ -2(\sqrt{5}-3) \\ 2(3-\sqrt{5}) [/tex]