Answer:
the value if x is 15
Explanation:
Use Pythagoras theorem
x² = (x - 3)² + 9²
x² = x² -3x -3x + 9 + 81
x² = x² -6x + 90
x² - x² + 6x = 90
6x = 90
divide through by 6
x = 90/6
x = 15
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