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(25y2 - 64) is the same thing as (5y + 8) times (5y - 8).

That's only the factored form. It doesn't tell you how much the whole thing is equal to.

That depends on the value of 'y', and it changes immediately any time 'y' changes.

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13y ago
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Q: What is 25y to the second power minus 64?
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