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= 6√4.2 + 5√100.2 -12√36.2
= 6.2 √2 + 5.10 √2 -12.6 √2
= 12√2 + 50√2 - 72√2
= 6 X 2 X V2 + 5 X 10 X V2 - 12 X 6 X V2
= 12V2 + 50V2 - 72V2
= - 10V2 (negatif 10 akar 2)
b. 4(5 - V6) (V3 + V2) = (20 - 4V6) (V3 + V2)
=20V3 + 20V2 - 4V18 - 4V12
= 20V3 + 20V2 - 4V9X2 - 4V4X3
= 20V3 + 20V2 - 4 X 3 X V2 - 4 X 2 X V3
= 20V3 + 20V2 - 12V2 - 8V3
= 12V3 + 8V3
( tanda V artinya akar )