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Verified answer
Subsitusikan x = 1 ke kedua kurvaf (1) = 2(1^2) +6.1 + c
f (1) = 8 + c
g (1) = 1^2 + 5.1 + 3
g (1) = 9
karena berpotongan maka kedua kurva melalui sebuah titik yang sama di x = 1, maka f(1) = g(1).
8 + c = 9
c = 1