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a. (3 + √5) + (3 - √5) = 6
(3 + √5) (3 - √5) = 9 - 5 = 4
x² - 6x + 4 = 0
b. (x - 2) (x - √3) = 0
x² - (2 + √3)x + 2√3 = 0
c. (√5 - 3) + (√5 + 3) = 2√5
(√5 - 3) (√5 + 3) = 5 - 9 = -4
x² - 2√5x - 4 = 0