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x = -b/2a
x = -(-4)/2(-2)
x = -2
selanjutnya x = -2 disubtitusikan ke f(x) = -2x^2 - 4x - 5 sehingga
f(-2) = -2(-2)^2 -4(-2) -5 = -8 + 8 - 5 = -5
maka koordinat titik balik grafik tersebut adalah (-2, -5)