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f(- x) = f(x) ← ¡Funciones pares!
f(x) = x⁴ + 3x² + 4
f(- x) = (- x)⁴ + 3(- x)² + 4
f(- x) = x⁴ + 3x² + 4
¡Si es simétrica!
Espero haberte ayudado, saludos!