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x² = y-1
y = 1+x²
subtitusi y = 1+x²:
x+1+x² = 3
x²+x-2 = 0
(x+2)(x-1) = 0
x= -2 atau x= 1
saat x= 1; maka y= 2
selisih= 2-1
= 1
saat x= -2; maka y= 5
selisih= 5+2
= 7, selisih terbesar adalah 7