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X1,2 = -b +- akar D / 2a
a=2 b=-4 c= -5
cari Dnya dulu (diskriminan)
D = b^2 -4(a)(c)
= 16 -4(2)(-5)
= 56
maka x1,2 =
X1 = 4 + 2 /4
= 1 +
dan x2 = 1 -