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x = -------------------------
2a
-(-5) +/- √(-5)² - 4(1)(4) 5 +/- √25-16 5 +/- 3
x = ------------------------------------- = --------------------- = -----------
2 (1) 2 2
5+3 5 - 3
x1= -------- = 4 x2 = --------- = 1
2 2