can some one help me with this function operation
If and g(x) = 5 – 2x, evaluate f(x) – g(x) for x = 5.

Question

can some one help me with this function operation
If and g(x) = 5 – 2x, evaluate f(x) – g(x) for x = 5.

anonymous · Answer

what is f(x)?

anonymous · Answer

the f(x) will be$$f(x)=2x ^{2}-4x$$

anonymous · Answer

so simply substitute for x=5 in the f(x) , then substitute for x=5 in g(x)
then subtract your f(x)'s answer - g(x)'s answer

anonymous · Answer

then the answer would be 15 because $$2(5)^{2}-4(5)-5-2(5)$$ would equal 50-20-5-10 then u sutract 50 and 20 would equal 30-5-10 then it would be 25-10 and that would equal 15 right?

anonymous · Answer

@Purplerainbowcherry

anonymous · Answer

sorry i had to step away for a second,
you got the f(x) part correct, however when you substitute 5 in g(x) you get 5-10=-5
so 30-(-5)=35