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## #1 2006-11-10 05:49:58

Neha
Member
Registered: 2006-10-11
Posts: 173

### f(x)

let f(x) = x + 3  and g(x) = x^2 + 1
find: (f-g)(3)

i did>
f(x) = x + 3
- g(x) = x^2 + 1
----------------------------
(f-g)(x) = x+3-(x^2+1)
= x - x^2 - 2
(f-g)(3) = 3 - 3^2 - 2
= 3 - 9 - 2
= -8

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## #2 2006-11-10 05:54:54

luca-deltodesco
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Registered: 2006-05-05
Posts: 1,470

### Re: f(x)

f-g -> x - x^2 + 2

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## #3 2006-11-10 06:21:26

Neha
Member
Registered: 2006-10-11
Posts: 173

### Re: f(x)

why is it 2 instead of 1

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## #4 2006-11-10 06:36:11

luca-deltodesco
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Registered: 2006-05-05
Posts: 1,470

### Re: f(x)

you said f(x) = x+3, and g(x) = x^2 + 1, 3-1 = 2?

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## #5 2006-11-10 06:49:45

Neha
Member
Registered: 2006-10-11
Posts: 173

### Re: f(x)

oh yeah i see that now
so my answer is now -4
correct

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