Bentuk Sederhana dari (5-2√2) (4+3√2) beserta caranya

[tex](5 - 2 \sqrt{2} )(4 + 3 \sqrt{2 })\\ = 5.4 + 5.3 \sqrt{2 } - 2 \sqrt{2}.4 - 2 \sqrt{2} .3 \sqrt{2} \\ = 20 + 15 \sqrt{2} - 8 \sqrt{2} - 6.2 \\ = 20 - 12 + (15 - 8) \sqrt{2} \\ = 8 + 7 \sqrt{2} [/tex]