HELP I GOT THE WRONG ANSWER
Medal+Fan

If f(x) = 3x + 5 and g(x) = 2x - 9, find f(x) - g(x).
A. 5x + 4
B. x - 4
C. x + 14
D. 5x - 4

I choose answer B but i got it wrong

Question

HELP I GOT THE WRONG ANSWER
Medal+Fan 

If f(x) = 3x + 5 and g(x) = 2x - 9, find f(x) - g(x).
A. 	5x + 4 
B. 	x - 4 
C. 	x + 14 
D. 	5x - 4 

I choose answer B but i got it wrong

phi · Answer

f(x) is short for 3x+5  (we know this because they tell us  f(x)= 3x+5 )
g(x) is short of 2x-9  (we know this because they tell us)

what is f(x)-g(x) ?  use the "long form":
3x + 5 - (2x-9)

now simplify that.  can you do that ?

anonymous · Answer

5x + 4  @phi

phi · Answer

how did you get that ?

you start with  3x+5 - 1*(2x-9)
you should distribute the -1  (that means multiply each term inside the parens by -1
can you do that ?