Question

f(x)= 4x+1

and g(x)=x^2-5

find (f-g)(x)

I got X^2-4x-6

and for (f+g)(x)

I got x^2+4x+4

I'm a bit unsure if the subtraction is right though.

Answer 1

which is being subtracted from which?

Answer 2

write it out and you'll never make a mistake.

Answer 3

well, almost never

Answer 4

Wait I got it!

Answer 5

"find (f-g)(x)

I got X^2-4x-6": Be careful with your signs. First write f(x) and then g(x):

f(x) = 4x + 1, g(x) = x^2 - 5

Since you are SUBTRACTING g(x) from f(x), enclose g(x) in parentheses and write a '-' sign in front of it:

f(x) - g(x)

Answer 6

Goood. Satisfied?

Answer 7

6+4x-x^2

Answer 8

I was a bit confused because of the answers none of the others started with the numerical value they all started with the x^2 I knew subtracting meant the -5 would become +6

Answer 9

Looks good! (f-g)(x+ = -x^2 +4x + 6

Answer 10

4x+1-x^2-(-5) makes it positive +5

Answer 11

there you go but it is customary to start with the highest power of x first and then in descending power...

-x^2 + 4x + 6

Answer 12

...where I intentionally wrote the terms in order by descending powers of x.

Answer 13

...same as @pgpilot326

Answer 14

Yeah I know, thank you guys!

Answer 15

lol