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x =
4k ± √16k² - 12k - 36
_______________
. . . . . . . . .2
4k ± √4(4k² - 3k - 9) =
4k ± 2√4k² - 3k - 9
_____________
. . . . . . . . 2
2k ± √4k² - 3x - 9