Tolong ya no 8-10 Beserta cara, buat belajar UAS soalnya. Makasih:)

8) L = p × l
L = ( √7 + 2 )( √7 - 2 )
L = 7 + 2√7 - 2√7 - 4
L = 3 ( A )

9) 8
---------
√5 + 3

= 8 ( √5 - 3 )
------------------------
( √5 + 3)( √5 - 3)

= 8 ( √5 - 3 )
-------------------------
5 + 3√5 - 3√5 - 9

= 8(√5 - 3)
------------------
- 4

= - 2 ( √5 - 3 ) ( dikali negatif)

= 2 ( 3 - √5 ) ( B )


10) bunga 6 bln
= 6/12 × 18%
= ½ × 18%
= 9 %
jumlah bunga
= 9% × 2.000.000
= 9/100 × 2.000.000
= 180.000 ( C )