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a=1
b=-4
c=2
x1,x2 = [-b +- √(b²-4ac)] / 2a
x1,x2 = [-(-4) +- √{(-4²)-4(1)(2)}] / 2(1)
x1,x2 = [4 +- √8] / 2
x1,x2 = [4 +- 2√2] / 2
x1,x2 = [2 +- √2]
x1 = 2 + √2
x2 = 2 - √2
selanjutnya caranya sama persis