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Diketahui fungsi parabola.
f(x) = 3x^2 + x + c
Melalui titik (-2,3)
Substitusi titik tersebut kedalam fungsi parabola untuk mencari nilai c
f(-2) = 3
3(-2)^2 + (-2) + c = 3
3.4 - 2 + c = 3
12 - 2 + c = 3
10 + c = 3
c = -7
c + 6
-7 + 6
-1