sqrt(X - 6) = 3
square both sides
X - 6 = 9
add 6 to each side
X = 15
----------------check in original equation
sqrt(15 - 6) = 3
sqrt(9) = 3
3 = 3
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3
5 times the square root of two over 3 times the square root of two equals 5/3
The square root of eight is in between the square root of 7 and the square root of 9, which equals 3.
x = 9
a = -4