Which statement describes the domain of the function f(x)=3x/(4x^2-4)

The complete question in the attached figure

we have that
f(x)=3x/(4x²-4)

we know that
the denominator can not be zero
so
(4x²-4)=0
4x²=4
x²=1----> x=(+/-)√1
x1=1
x2=-1
the values of x=1 and x= -1 make the denominator zero, therefore they do not belong to the domain of the function

the answer is
the domain of the function is all real numbers except 1 and -1

1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable