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<-1; 2>
f(-1) = -2 · (-1)² + 4 · (-1) - 1 = -2 - 4 - 1 = -7
f(2) = -2 · 2² + 4 · 2 - 1 = -2 · 4 + 8 - 1 = -8 + 7 = -1
p = -4 / -4 = 1 ∈ <-1; 2>
f(p) = f(1) = -2 · 1² + 4 · 1 - 1 = -2 + 4 - 1 = 1
Odp.: f(-1) = -7 <-- wartość najmniejsza; f(1) = 1 <-- wartość największa