Titik ekstrim daei fungsi f(x)=-xkuadrat +4x-6

x = -b/2a
x = -4/2(-1)
x = -4/-2
x = 2

f(2) = -2^2 + 4(2) - 6
f(2) = -4 + 8 - 6
f(2) = -2

titik ekstrimnya (2, -2)