tolong bantuin cari jawaban ya dong

[tex]u4 = 2 \times {4}^{2} - 5 \\ = 2 \times 16 - 5 = 32 - 5 = 27 \\ u5 = 2 \times {5}^{2} - 5 = 2 \times 25 - 5 = 45 \\ u4 + u5 = 27 + 45 = 72[/tex]