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a=1
b=0
c=-4
rumus abc:
x1= atau
x2=
jadi x1 = -0+√0-4(1)(-4)/2.1 = 2
x2 = -0-√0-4(1)(-4)/2.1 = -2
a = 1
b = 0
c = -4
x1,2 = -b + √b² - 4ac / 2a
= 0 + √0 - 4(1)(-4) / 2(1)
= √16 / 2
x1 = 4/2 atau x2 = -4/2
= 2 = -2