Question

Given the function f(x) = −2x + 10, find x if f(x) = 18.

Answer 1

\[18 = -2x+10\]First step: add 2x to both sides. What do you get?

Answer 2

Well, once you get it, the next step is to subtract 18 from both sides.

Answer 3

i got -6

Answer 4

Nope. Show me what you got after the first step

Answer 5

you get 12 if you add 2

Answer 6

Sorry, add 2x not 2.
\[18 = -2x+10\]Now add \(2x\) to both sides.\[18 + 2x=10\]Make sense?

Answer 7

Now you have \(18+2x=10\) we can subtract 18 to get \(2x=-8\)
Hopefully from there it should be ok?

Answer 8

\[f(x) = =-2x+10 , f(x)=18\]\[18=-2x+10 \] solving for x, we will eliminte the right side of the equation. \[18-10= 2x+10-10\]\[8=-2x\]\[x=-\frac{ 8 }{ 2 }\] simplify

Answer 9

-4?

Answer 10

Yep.