How to find the potential rational zeros of the function: f(x)=77x^4-x^2+49

±{all integer factors of 49} / {all integer factors of 77}
so
{±1, ±7, ±49} / {1, 7, 11, 77}
{±1, ±1/7, ±1/11, ±1/77, ±7, ±7/11, ±49, ±49/11}

ignore duplicates: ±7/7, ±7/77, ±49/7, ±49/77

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