Answer:
Step-by-step explanation:
We translate the phrase into an equation:
Then we simplify:
16x4 + 16x – 16x – 64
16x4 – 8x – 8x – 64
(4x2 + 8)(4x2 – 8)
16(x2 + 2)(x2 – 2)
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Answer: 15%