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2³ = (x²-4x+5)
x²-4x+5-8=0
x²-4x-3=0
maka a=1 b= - 4 c= -3
x1²+x2² = (x1+x2)²-2x1x2
(-b/a)² - 2(c/a)
(4)²-(2.-3)
16+6 = 22
KALAU X1+x2
x1+x2 = -b/a = 4