Answer:
x² + (x + 3)² = 15²
x² + x² + 6x + 9 = 225
2x² + 6x - 216 = 0
x² + 3x - 108 = 0
(x - 9)(x - 12) = 0
x = 9, 12
The ladder reaches 12 feet up the wall.
The distance between the ladder and the wall is 9 feet.
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