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Mathematics 20 Online
OpenStudy (carolina4567):

Check My Answer's Real Quick! Thank You :)

OpenStudy (carolina4567):

v(t) = 24,500 (0.80^t)

OpenStudy (carolina4567):

Find the initial value of the car and the value after 12 years. Initial Value = 24,500 After 12 years = 1683

OpenStudy (carolina4567):

Am I Correct ?

OpenStudy (fortytherapper):

Looks good

jhonyy9 (jhonyy9):

for initial value t=0 yes ?

OpenStudy (carolina4567):

Mind Helping with a few more ?

OpenStudy (fortytherapper):

Yeah I'll try. I'm on mobile phone now

OpenStudy (carolina4567):

h(x) = 2x^2 + 4 Find h(4x) My Answer is h(4x) = 16x^2 + 5 / 4x

OpenStudy (fortytherapper):

How'd you get the fraction?

jhonyy9 (jhonyy9):

do you think h(4x) or just h(4) ?

OpenStudy (carolina4567):

Umm h(4x) = 2(4x)^2 + 4

OpenStudy (carolina4567):

I think 4x

jhonyy9 (jhonyy9):

so in this case what you have wrote above is right sure

OpenStudy (carolina4567):

Ok great :) I have a few more to check

jhonyy9 (jhonyy9):

but you need ending it again or do you like it in this form ?

jhonyy9 (jhonyy9):

4x squared multiplied by 2

OpenStudy (carolina4567):

f(x) = 2x^2 g(x) = 4x (f x g ) (x ) = 8x^4 ( f -g) (x) = -2x^2 (f+g) (-2) = 2x^2 - 8

OpenStudy (carolina4567):

Its fine the teacher wants it like that

jhonyy9 (jhonyy9):

x^2*x why is x^4 ?

OpenStudy (carolina4567):

Hm not sure :/ , Thats what i got when I did the math

jhonyy9 (jhonyy9):

a^2 *a=a^3 use this please

jhonyy9 (jhonyy9):

2x^2 *4x=2*4*x^2 *x = ?

OpenStudy (carolina4567):

8x^3

jhonyy9 (jhonyy9):

exactly now is right sure

OpenStudy (carolina4567):

So now there all right ?

jhonyy9 (jhonyy9):

(f-g)(x)=?

OpenStudy (carolina4567):

-2x^2

jhonyy9 (jhonyy9):

why so ? not is right what is f(x) and what is g(x) ?

OpenStudy (carolina4567):

f(x) is 2x^2 g(x) is 4x

jhonyy9 (jhonyy9):

so than how will be (f-g)(x) = ?

jhonyy9 (jhonyy9):

in this case just substract the g(x) from f(x) so how will be than ?

OpenStudy (carolina4567):

2x(x-2) ?

jhonyy9 (jhonyy9):

this is very very easy

jhonyy9 (jhonyy9):

exactly very nice yes ?

jhonyy9 (jhonyy9):

this is more easy than you believ it

OpenStudy (carolina4567):

So the last one is -4x^2+4x ?

jhonyy9 (jhonyy9):

(f+g)(-2)=? first how will be (f+g)(x)=?

OpenStudy (carolina4567):

2x^2 + 4x = 2x(2+x) ?

jhonyy9 (jhonyy9):

2x^2 +2x =(f+g)(x)

jhonyy9 (jhonyy9):

yes so now than you know this just you need substituting the -2 in place of x yes ?

jhonyy9 (jhonyy9):

yse 4x sorry

jhonyy9 (jhonyy9):

2x^2 +4x my bad

OpenStudy (carolina4567):

So thats our answer ?

jhonyy9 (jhonyy9):

in this case of 2x^2 +4x for you get the (f+g)(-2) = ? just you need substituting the -2 in place of x inside equation 2x^2 +4x

OpenStudy (carolina4567):

2x^2 +4(-2) ?

jhonyy9 (jhonyy9):

yes but in place of first x too

OpenStudy (carolina4567):

Oh sorry 2(-2)^2 +4x

OpenStudy (carolina4567):

4x + 8 ?

jhonyy9 (jhonyy9):

now you have forgot the second x place

jhonyy9 (jhonyy9):

everywhere in place of x you need substituting the -2 ok. ?

OpenStudy (carolina4567):

Yes

jhonyy9 (jhonyy9):

so than what will get ?

OpenStudy (carolina4567):

0

jhonyy9 (jhonyy9):

yse exactly this is the right answer for (f+g)(-2) = 0

jhonyy9 (jhonyy9):

do you understand it now sure right ?

jhonyy9 (jhonyy9):

so than was my pleasure bye bye good luck

OpenStudy (carolina4567):

Thank You

jhonyy9 (jhonyy9):

np welcome

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