Answer:
Yes.
Step-by-step explanation:
First, draw a vertical line. Then check the interception between the graph and a vertical line.
If the line intercepts the graph only one point, then it is a function. Otherwise, it is not. That includes two or more.
The graph shown in the picture is a function (Cubic Function).
The illegal values of b are when the denominator equals 0.
So, 
gives you (b-4)(b+2)=0
Therefore, b=4 and b=-2, which is answer A.
Answer:
If you are just looking for a simplified answer then the answer is -7x - 3.
It is negative.
When you subtract a negative a positive number from a negative number, the result is positive. The equation can be rewritten as -8.8-(+3.4).
