(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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4 cubed is 64, 3 squared is 9, so 55.
(4x-8)2 = (4x-8)(4x-8) = 16x2-32x-32x+64 = 16x2-64x+64
4(64 - 125b) or -4(125b - 64)
47 = 16384 43 = 64 → 47 - 43 = 16384 - 64 = 16320
76 minus 64 is 12.