Help please...
Let f(x)=-2x+4 and g(x)=-6x-7. find f(x)-g(x)

Question

Help please...
Let f(x)=-2x+4 and g(x)=-6x-7. find f(x)-g(x)

anonymous · Answer

put them in parentheses, then put a minus sign between them

anonymous · Answer

(-2x+4)-(-6x-7) 
like this? @satellite73

anonymous · Answer

yes
then distribute the minus sign for the second parentheses, and combine like terms

anonymous · Answer

4x-3

anonymous · Answer

close but you did not distribute completely

anonymous · Answer

$$(-2x+4)-(-6x-7) =-2x+4+6x+7$$

anonymous · Answer

4x+11 
I am confused

anonymous · Answer

your second answer is correct

anonymous · Answer

when you distribute the minus sign, you have to change the sign if each term you see

anonymous · Answer

Oh okay thank you! can you help me with 2 more questions?

anonymous · Answer

sure

anonymous · Answer

heres one
what is the inverse of the given relation? y=3x+12

anonymous · Answer

wow we really stepped it up from the last one!

anonymous · Answer

can you solve 
$$y=3x+12$$ for $x$?

anonymous · Answer

Yeah. 12+y=3x
4y=x how would i get y alone now.

anonymous · Answer

hmm 
lets start at the beginning

anonymous · Answer

I know i have to get x alone

anonymous · Answer

$$y=3x+12$$ and we want to solve for $x$
before i do it, let me ask you a question
do you have answer choices? or do you have to come up with it on your own
i just want to know what the choices look like before we start

anonymous · Answer

i have to type it all out i dont have answer choices.

anonymous · Answer

ok
i was asking because i don't know if your answer is suppose to look like $y=something$ or $x=something$ but not matter lets solve for $x$

anonymous · Answer

$$y=3x+12$$ solve for $x$ in two steps
1) subtract $12$ from both sides 
2) divide both sides by $3$

anonymous · Answer

$$y=3x+12\
y-12=3x\
\frac{y-12}{3}=x$$

anonymous · Answer

i know you get 4

anonymous · Answer

i dont know where to put it lol

anonymous · Answer

the reason i was asking the previous question is because i dont know if your answer is supposed bo be 
$$y=\frac{x-12}{3}$$ or 
$$x=\frac{y-12}{3}$$

anonymous · Answer

i am not sure what you mean

anonymous · Answer

i was dividing but now i get it.

anonymous · Answer

yeah when i say "divide' i don't really mean do a division, i just mean write it

anonymous · Answer

Oh okay. I have one more i need help on. 
rewrite 3^sqrt(27x-81-5) to make it easy to graph using a translation.

anonymous · Answer

is this really 
$$\sqrt[3]{27x^2-81-5}$$? seen unlikely

anonymous · Answer

yes.

anonymous · Answer

i have no idea
repost this as a new question and maybe you will get a good answer

anonymous · Answer

I figured it out thank you though!