-- It's the product of (A/4 + b/5) times (A/4 - b/5).
-- Its value will depend on the values of 'A' and 'b'.
It will change whenever either of them changes.
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4x2/81 = 1 - 16x2/25100x2 = 25*81 - 16*81x21396x2 = 2025x2 = 2025/1396x = +/- 1.2044, approx.
zero
25 + 16 - 13 - 21 = 7
(3y - 5)(y + 5)
It is: 9+16 = 25