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*untuk 23 yg tak memiliki akar
1-2√4-23 = 1-2.2-23
= 1-4-23
=-3-23
=-26
*untuk yang 2√3
1-2√4-2√3 = 1-4-2√3
=-3-2√3
= - (2+2√3)
semoga membantu