Answer:
Yes, it is.
Explanation:
For x = 4 to be a solution of the given eqⁿ, it must satisfy it. That is,
9x = 32 + x => 8x - 32 = 0
=> f(x) = 8x - 32
At x = 4,
f(4) = 8(4) - 32 = 32 - 32 = 0
Since, f(4) = 0, thus, x = 4 is a solution to the given eqⁿ.