Question

If f(x) = x2 − 2x + 9 and g(x) = 8 − x, what is (f o g)(−4)?

Answer 1

ineed an aswer please

Answer 2

Why not post this in the math section?

Answer 3

Anyway:
f(g(x)= 2(8−x) − 2(8−x) + 9 = 16-2x=9
f(g(-4))=9
if my calculations are right

Answer 4

eh forgot f(x) can be rewritten to 0+9.. therefore the answer is ofcuase always 9

Answer 5

How did I get 111?

Answer 6

Becasuse if x = -4,

then the first thing we need to do is solve for g(x),

right?

g(x) is 8 - x.

So, if x = -4,
then g(x) = 12.

Right so far?

Answer 7

And THEN we take 12,
and we plug it in for all the X's, in f(x).

Answer 8

That's 12^2 - 2(12) + 9

Answer 9

We add before we subtract.

So that'd be...

144 - 33.

And that's 111.

Answer 10

oh is it x^2.... i thought it was 2 times x

Answer 11

2x x2 acfsd we see as multuiplication in mathmatics. 2*x, x*2, a*c*f*s*d.

Answer 12

Yeah I know what you mean.

I also knew that whenever we multiply X with 2,
it's usually shown as 2x.

Answer 13

Hmmm then you need quite alot of good will.

Answer 14

@bobbya

Did you mean to say "X squared,"
when you wrote "x2"?

Answer 15

@Frostbite

Good will?

Answer 16

I just ment i calculated what I saw :P

Answer 17

Not what I had to guess he ment ^^

Answer 18

I get it. Just curious really.