Let $f(x) = ax^6 + bx^4 - cx^2 + 3.$  If $f(91) = 1$, find $f(91) + f(-91)$.
Question:
Let $f(x) = ax^6 + bx^4 - cx^2 + 3.$  If $f(91) = 1$, find $f(91) + f(-91)$.
Answer:
Let's think step by step.

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Let $f(x) = ax^6 + bx^4 - cx^2 + 3.$  If $f(91) = 1$, find $f(91) + f(-91)$.
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