Question

f(x)=-x^2+4x-4 four step method f(1)=? f(2)=? f(3)=?

Answer 1

can someone help me please!!

Answer 2

r we finding for f(1), f(2) and f(3)?

Answer 3

Well, you only have to calculate using x=1......\[f(1)=-(1)^{2}+4(1)-4=1\]\[f(2)=-(2)^{2}+4(2)-4=8\]\[f(3)=?\]Try doing f(3) yourself.

Answer 4

yes

Answer 5

is that the four step method?

Answer 6

lol so many steps?

Answer 7

huh

Answer 8

as ivancsc1996 showed, it can be done in one

Answer 9

f'(x)=?

Answer 10

f'(x)= -2x+4

Answer 11

Oh that's the derivative which is what HawkCrimson showed.

Answer 12

f(3)=13?

Answer 13

No, 17

Answer 14

i though you subtract 4

Answer 15

thought

Answer 16

Oh no it is -1

Answer 17

f(x)=-x^2+4x-4
f(3)=-(3)^2+4(3)-4
f(3)=-9 +12 -4
f(3) = -1

Answer 18

thanks

Answer 19

find the derivative of (13x^2-26x+26)e^-8x

Answer 20

u'll have to use the product rule

Answer 21

ok

Answer 22

so let u = (13x^2-26x+26) and v = e^-8x
where U(dv/dx) + V(du/dx)

Answer 23

13(x^2-2x+2)e^-8x

Answer 24

thats my answer

Answer 25

ill do it now but that answer seems too similar to the question, did u use the product rule
V(du/dx) + U(dv/dx)?

Answer 26

yeah

Answer 27

im looking at a similar one on my book idk if this is right but its my educated try

Answer 28

ill tell u the answer in a sec, im almost done

Answer 29

ok

Answer 30

i got something different but i got big numbers lol ill show u my working

Answer 31

ok

Answer 32

the question is find the derivative with respect to x if y

Answer 33

so to find dy/dx?

Answer 34

how i did it was like this
y = (13x^2-26x+26)e^-8x
and now im solving for dy/dx, isnt that wat u want?

Answer 35

yes

Answer 36

U = 13x^2 - 26x + 26 V = e^-8x
du/dx = 26x - 26 dv/dx = -8e^-8x

Answer 37

so thats the answer?

Answer 38

no, that is half of the working

Answer 39

oh ok

Answer 40

V(du/dx) + U(dv/dx)
(e^-8x)(26x - 26) + (13x^2 - 26x + 26)( -8e^-8x)
2e^-8x [ (13x - 13) + -4(13x^2 - 26x + 26)
2e^-8x [ (13x - 13) + (-52x^2 + 104x - 104) ]
2e^-8x [ -52x^2 + 117x - 117 ]

Answer 41

I dont think its asking for that because i just did a similar problem (15x^3+9x^2+20x-4)^e-5x answer:(3x^3-4x)e^-5x

Answer 42

I thought it was asking for the opposite way instead of solving

Answer 43

lol so the question wasnt asking for dy/dx?

Answer 44

the question is find the derivative with respect to x if y

Answer 45

whatever that means

Answer 46

xD so wat method did u use?

Answer 47

so r u saying my answer is wrong?

Answer 48

product and chain rule

Answer 49

idk it just look different than my book

Answer 50

the answer in my book from the example problem i showed you

Answer 51

is it (15x^3+9x^2+20x-4)^e-5x or (15x^3+9x^2+20x-4)e^-5x ??