Answer:
54
Explanation:
I'm assuming you are referring to x = 6, then to find the value of x(15 - x).
If x = 6, we can substitute this value into the expression x(15 - x) to find its value:
x(15 - x) = 6(15 - 6) = 6(9) = 54
Therefore, if x = 6, then x(15 - x) = 54.