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B. 8 akar 5 + 2 akar 5 = 10 akar 5
C. (3+akar5)(3+akar5) = 9+ 3 akar5 + 3 akar5 + 5
9+6 akar5 + 5
14+ 6 akar5
=> 5√2 + 12√3
b).
=> 8√5 + 2√5
= 10√5
c).
=> ( 3 + √5 ) ( 3 + √5 )
= 9 + 3√5 + 3√5 + 5
= 14 + 6√5