Diketahui [tex] \sqrt{ \sqrt[3]{2a + 2 } } = 2[/tex] Nilai a adalah...

[tex] \sqrt{ \sqrt[3]{2a + 2} } = 2 \\ \sqrt[3]{2a + 2} = 4 \\ 2a + 2 = 64 \\ 2a = 62 \\ a = 31[/tex]