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a = -2 b = -8 c = 15
x = [ 8 +- √184 ] / 2(-2)
x = [ 8 +- 2√46 ] -4
x = (-8/4) +- (-2√46 / 4)
x = ( -8 -2√46) / 4
x = ( -8 +2√46) / 4
x = (-4-√46)/2
o
x = (-4+√46)/2
x² + 2x + 4 = 0
a = 1
b = 2
c = 4
x = [ -2 +- √2²-4(1)(4) ] / 2(1)
x = ( -2 +- √ -12 ) / 2
x = ( -2 +- 2√3 i ) / 2
x = -1 + √3 i
o
x = -1 - √3 i