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If y = y(x) satisfies the differential equation dy x 9 x 8 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = dx x 9 4 1 − ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + + , x > 0 and y(0) = 7 , then y(256) =
- 3
- 9
- 16
- 80
Correct answer: 3
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