Bentuk sederhana dari 3-√7 per 3+√7 adalah

3 - √7 / 3 + √7
= (3 - √7) (3 - √7) / (3 + √7) (3 - √7)
= 9 - 6√7 + 7 / 9 - 7
= 9 + 7 - 6√7 / 2
= 16 - 6√7/2
= 2(8 - 3√7) / 2
= 8 - 3√7

[tex] \frac{3- \sqrt{7} }{3+ \sqrt{7} } . \frac{3- \sqrt{7} }{3- \sqrt{7} }= \frac{(3- \sqrt{7}) ^{2} }{9-7} = \frac{9-6 \sqrt{7}+7 }{2} = \frac{16-6 \sqrt{7} }{2}= \frac{2(8-3 \sqrt{7}) }{2} =8-3 \sqrt{7} [/tex]