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cari a nya.. digambar kita tau grafik memotong sumbu y di titik (0,4)
grafik memotong di sb.x pada titik (-2,0) dan (1,0)
masukan ke rumus..
4 = a (x+2) (x-1)
4 = a (x^2 + x -2)
x=0
4 = a(-2)
a = -2
jadi persamaan grafiknya y= -2x^2 -2x + 4