tolong sama caranya yg benar

Mapel : Matematika
Bab : Akar

[tex]3 \sqrt{54} + 3 \sqrt{16} - 3 \sqrt{250} [/tex]
[tex] = 3 \sqrt{9 \times 6} + 3 \times 4 - 3 \sqrt{25 \times 10} [/tex]
[tex] = 3 \times 3 \sqrt{6} + 12 - 3 \times 5 \sqrt{10} [/tex]
[tex] = 9 \sqrt{6} + 9 - 15 \sqrt{10} [/tex]

kalau tidak salahhhh... mudah2an benarr