Question

Given: f(x) = 2x2 – 3x + 4 g(x) = x + 3

Find: (f+g)(x)

Answer 1

(f+g)x=f(x)+g(x)

Answer 2

2x^2-2x+7

Answer 3

So do i replace it with the given and solve it all in?

Answer 4

yup..

Answer 5

add both

Answer 6

alright let me try it, i'll solve.

Answer 7

got it?

Answer 8

Wait, i got confused in the second equation from the first equation

Answer 9

2x^2 is 4x right?

Answer 10

\[2x^2-3x+4+x+3=2x^2-2x+7\]

Answer 11

no no..

Answer 12

combine like terms?

Answer 13

there is no need to "SOLVE" this

Answer 14

i thought you were talking about combining

Answer 15

so ill just subtract and add?

Answer 16

pardon me, im not good with math

Answer 17

ya..

Answer 18

jus like numbers

Answer 19

so lets go back to our equation,2x^2-2x+7 so what will i do first sine it has "x" in it?

Answer 20

*since

Answer 21

I mean the 2x^2

Answer 22

no need to do anything..We wont have to find the x

Answer 23

2-2 +7?

Answer 24

what we wrote is the answer

Answer 25

OH!

Answer 26

got it?

Answer 27

do you still need to solve it when you distribute the given to the question?

Answer 28

Actually we dont solve it unless we are told to find (f+g)(3),(f+g)(4) and stuff...then we substitute that value to our x's

Answer 29

suppose you are told to find (f+g)(3) then the answer will be 2(3^2)-3(3)+7 =18-9+7=16

Answer 30

isnt it suppose to be written like this? (2x^2-3x+4+x+3) And what is "(x)"?

Answer 31

yeah...-3x+x=-2x and 4+3=7..so we wrote it simply like our answer

Answer 32

you dont have to know what is x

Answer 33

Waht happened to 2x^2? wow im really confused right now.

Answer 34

it is there..our final answer is \[2x^2-2x+7\]

Answer 35

FINAL!!!

Answer 36

Alright, lets go back because we are having a quiz on functions, ill try to answer this alright?

Answer 37

Given: f(x) = 2x2 – 3x + 4 g(x) = x + 3

Find: (f+g)(x)

Answer 38

ok..nothing special happened here..we just added both functions

Answer 39

So ill distribute the given to my equation right?

Answer 40

distribute?what do you mean?

Answer 41

I mean replace it or something

Answer 42

no..actually we had our final answer..now u dont need to do anything

Answer 43

Hahaha alright, thanks for helping, ill try to review the steps ey'

Answer 44

are you thinking of substituting a value to x?

Answer 45

No, i mean the given will be written in the "(f+g)(x)" problem

Answer 46

we found the (f+g)(x)

Answer 47

so (f+g)(x) is = to (2x^2-3x+4+x+3) right?

Answer 48

also, whats the "(x)"?

Answer 49

oh (x)?

Answer 50

yeah

Answer 51

(x) is just the symbol..it has no value

Answer 52

you can give any value to it

Answer 53

so what will i do with it?

Answer 54

(f+g)(x) is just like writing (f)(x)

Answer 55

(f+g)and (x) are not seperate things

Answer 56

Alright, last question, what is 2x^2-3x+4+x+3... So its

=4x-3x+4+x+3
=1x+4+x+3

Am i doing it right?

Answer 57

if yes, should i continue?

Answer 58

2x^2 is not 4x

Answer 59

why?

Answer 60

2x^2=2x^2

Answer 61

4 is 2^2

Answer 62

it is 2*(x^2)

Answer 63

not 2^2 * (x)

Answer 64

You seperated x^2?

Answer 65

ya..2 and x^2 are different

Answer 66

sorry i need to go..bye

Answer 67

2x^2-3x+4+x+3
=2(x^2)-3x+4+3=x

is that right?

Answer 68

Alright, thanks

Answer 69

@Colcaps

Answer 70

you got 2x^2-3x+4+x+3?

Answer 71

Yes

Answer 72

2x^2-3x+4+x+3
=2(x^2)-3x+4+3=x ???
it should be this..am i right @Krishnadas 2x^2-2x+7..

Answer 73

ya you are right @pengembara_bumi1 ...

Answer 74

so @Colcaps now add -3x and x

Answer 75

ouh,thanks..hehe ^_^

Answer 76

-2x?

Answer 77

ya..now add 4 and 3

Answer 78

@Colcaps

Answer 79

7

Answer 80

4+3 is 7 yeah

Answer 81

@Krishnadas

Answer 82

so what are the terms left,2x^2 ,-2x and +7

Answer 83

adding them gives our final answer

Answer 84

2-2+7=x?

Answer 85

no 2x^2-2x+7

Answer 86

which equals (f+g)(x)

Answer 87

got it?

Answer 88

OH!

Answer 89

why is there a doubt?:D

Answer 90

okay??

Answer 91

I thought youll look for the result of it so i got really confused

Answer 92

Thank you for teaching me mate, that means alot

Answer 93

this is our result..2x^2-2x+7

Answer 94

Happy to help:D

Answer 95

i have another question but its harder than this, ill make a new one

Answer 96

ok