Answer:
10
Explanation:
You want a number such that the square root of the sum of it and 8 is 3 times the square root of 2.
Equation
The relation in the problem statement is ...
√(x +8) = 3√2
Solution
Squaring both sides, we have ...
x +8 = 3²·2 = 18
x = 10 . . . . . . . . . subtract 8
The number is 10.
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