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Penjelasan dengan langkah-langkah:

f(x) = 2x^2 – 5x + 1

Sumbu Simetri

x = -b/2a

= -(-5)/2×2

= 5/4

Titik Balik (Nilai optimum)

x = 5/4

f(5/4) = 2(5/4)^2 – 5(5/4) + 1

= 25/8 – 25/4 + 1

= 1/8(25 – 50 + 8)

= -17/8