Question

5(4/5)^2+8(4/5)-6 =???

Answer 1

18/5

Answer 2

how did you get that

Answer 3

see 5 (4/5)^2 is 5 (16/25) = 16/5

Answer 4

8(4/5) = 32/5

Answer 5

u add both f these u get 48/5

Answer 6

then u subtract 6
which is
(48/5) - 6
(48-30)/5
18/5

Answer 7

got it?

Answer 8

thanks! I am trying to do relative minima and maxima
problems

Answer 9

I am lost as hell!

Answer 10

how old r u?

Answer 11

40

Answer 12

just went back to college

Answer 13

kk

Answer 14

ur my mums age almost

Answer 15

haha

Answer 16

cn i help smwher?

Answer 17

that would be awesome

Answer 18

how do you determine when it is a minima or a maxima

Answer 19

see lets take an example of a cubic function f(x)

Answer 20

when you differentiate it to get f'(x) , u evaluate the roots of f'(x)

Answer 21

these r called critical points...these are the points where it can be maximum or minimum..the function that is

Answer 22

get it til here?

Answer 23

k.

Answer 24

got that

Answer 25

so now to determine whether its max or min, what u do is u differentiate once more to get f''(x)..now plug in ur critical point into it

Answer 26

Are you going to be on here long today? I have about 60 problems I have to do.

Answer 27

What determines if it is maxima or minima?

Answer 28

when u plug the point into f''(x), see the sign of the function

Answer 29

if its negative its min and positive max?

Answer 30

if the sign of f"(x) is negative its maxima, and viceversa

Answer 31

no the opposite

Answer 32

gotcha!
Thanks a million!

Answer 33

m not gonna b long inuf fr 60 problems..bt as much as i can

Answer 34

thanks
I am afraid I will be on here all weekend

Answer 35

no prob...well see wt we cn crack

Answer 36

According to th answer on mymathlab, the answer was -46/5.... how is that

Answer 37

nuthin wrong with 40s :)

Answer 38

well amistre check on that question she posted

Answer 39

which one?

Answer 40

right on top..

Answer 41

I really appreciate yall helping me!!!1

Answer 42

5(4/5)^2+8(4/5)-6 =??? this one

Answer 43

yep

Answer 44

yeah

Answer 45

5x^2 +8x -6 is a parabola; that looks like a bowl sitting on the counter; it has a local minimum at its vertex; ....i sctually finished typing this reply like 40 seconds ago; slow response time i guess

Answer 46

-b/2a = x compnent; -8/2(5) = -4/5 right?

Answer 47

5(-4/5)^2+8(-4/5)-6 = y
^^^
use (-)4/5

Answer 48

5(16/25) +8(-4/5)-6 = y

Answer 49

yeah denise i thought it was 4/5 while actually its -4/5

Answer 50

16 -32 -6
--------- =
5 5 1

Answer 51

6(5) = 30 s000

(16-32-30)/5

Answer 52

-46/5

Answer 53

makes sense?

Answer 54

yeah

Answer 55

k

Answer 56

where did the 6(5) come from???

Answer 57

cz u take the lcm while subtracting

Answer 58

to get the 30

Answer 59

yeah; fractions reguire you to be wearing the same pants; and that 6/1 is not dressup for company; so we got to changes its clothes to match .... we put it in 5 pants and find a top to match

Answer 60

lol!