Complete the square
first isolate x terms
y=(x^2-4x)-9
complete square inside (take 1/2 of square of b )
-4/2=-2, (-2)^2=4
add 4-4 inside
y=(x^2-4x+4-4)-9
complete the square
y=((x-2)^2-4)-9
y=(x-2)^2-4-9
y=(x-2)^2-13
X+x+3x= 180
5x= 180
x= 36
3(36)= 108
Your answer is D. $108
Ln 54.598... = 4 because ln = log e
