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kuadratkan
3 + √11 = (a + b) + √4ab
a + b = 3 ⇒ a = 3 - b
4ab = 11
4(3 - b)b = 11
4b² - 12b + 11 = 0
cari b nya dengan rumus (-b +- √(b² - 4ac))/2a
bil imajiner nntnya