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y = -x -b
x² + 3x +1 = -x - b
x² + 3x +1 + x + b = 0
x² + 4x + 1 + b = 0
syarat grafik fungsi kuadrat mempunyai 1 tipot
D = 0
b² - 4ac = 0
4² - 4.1.(1 + b) = 0
16 - 4 - 4b = 0
12 - 4b = 0
12 = 4b
b = 3