9. Упростите: -8√92 + 7√23

1. $$-8\sqrt{92} + 7\sqrt{23} = -8\sqrt{4 \cdot 23} + 7\sqrt{23}$$
2. $$-8 \cdot 2\sqrt{23} + 7\sqrt{23} = -16\sqrt{23} + 7\sqrt{23}$$
3. $$(-16+7)\sqrt{23} = -9\sqrt{23}$$