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a = (4√3 - 4)
a² = (4√3 - 4)²
= (4√3 - 4)(4√3 - 4)
= 16√9 - 2 . 4. 4√3 + 16
= 48 + 16 - 16√3
= 32 - 16√3
maka :
(x - a)² = (x - a) (x - a)
= x² - 2xa + a²
= x² - 2x.(4√3 - 4) + (4√3 - 4)²
= x² - (8√3 - 8)x - 32 - 16√3