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x= -b +- √b² - 4ac
2a
= -2 +- √(2)² - 4(4)(-1)
2(4)
= -2 +- √20
8
x1 = -2 + √20
8
= -2 + 2√5
8
= -1/4 (1-√5)
x2 =-2 - √20
8
= -2 - 2√5
8
= 2 +2√5
8
= 1/4 (1+√5)
tanda +- artinya plus minus