Denise
  • Denise
5(4/5)^2+8(4/5)-6 =???
Mathematics
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Denise
  • Denise
5(4/5)^2+8(4/5)-6 =???
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
18/5
Denise
  • Denise
how did you get that
anonymous
  • anonymous
see 5 (4/5)^2 is 5 (16/25) = 16/5

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anonymous
  • anonymous
8(4/5) = 32/5
anonymous
  • anonymous
u add both f these u get 48/5
anonymous
  • anonymous
then u subtract 6 which is (48/5) - 6 (48-30)/5 18/5
anonymous
  • anonymous
got it?
Denise
  • Denise
thanks! I am trying to do relative minima and maxima problems
Denise
  • Denise
I am lost as hell!
anonymous
  • anonymous
how old r u?
Denise
  • Denise
40
Denise
  • Denise
just went back to college
anonymous
  • anonymous
kk
anonymous
  • anonymous
ur my mums age almost
Denise
  • Denise
haha
anonymous
  • anonymous
cn i help smwher?
Denise
  • Denise
that would be awesome
Denise
  • Denise
how do you determine when it is a minima or a maxima
anonymous
  • anonymous
see lets take an example of a cubic function f(x)
anonymous
  • anonymous
when you differentiate it to get f'(x) , u evaluate the roots of f'(x)
anonymous
  • anonymous
these r called critical points...these are the points where it can be maximum or minimum..the function that is
anonymous
  • anonymous
get it til here?
Denise
  • Denise
k.
Denise
  • Denise
got that
anonymous
  • anonymous
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
Denise
  • Denise
Are you going to be on here long today? I have about 60 problems I have to do.
Denise
  • Denise
What determines if it is maxima or minima?
anonymous
  • anonymous
when u plug the point into f''(x), see the sign of the function
Denise
  • Denise
if its negative its min and positive max?
anonymous
  • anonymous
if the sign of f"(x) is negative its maxima, and viceversa
anonymous
  • anonymous
no the opposite
Denise
  • Denise
gotcha! Thanks a million!
anonymous
  • anonymous
m not gonna b long inuf fr 60 problems..bt as much as i can
Denise
  • Denise
thanks I am afraid I will be on here all weekend
anonymous
  • anonymous
no prob...well see wt we cn crack
Denise
  • Denise
According to th answer on mymathlab, the answer was -46/5.... how is that
amistre64
  • amistre64
nuthin wrong with 40s :)
anonymous
  • anonymous
well amistre check on that question she posted
amistre64
  • amistre64
which one?
anonymous
  • anonymous
right on top..
Denise
  • Denise
I really appreciate yall helping me!!!1
amistre64
  • amistre64
5(4/5)^2+8(4/5)-6 =??? this one
Denise
  • Denise
yep
anonymous
  • anonymous
yeah
amistre64
  • amistre64
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
amistre64
  • amistre64
-b/2a = x compnent; -8/2(5) = -4/5 right?
amistre64
  • amistre64
5(-4/5)^2+8(-4/5)-6 = y ^^^ use (-)4/5
amistre64
  • amistre64
5(16/25) +8(-4/5)-6 = y
anonymous
  • anonymous
yeah denise i thought it was 4/5 while actually its -4/5
amistre64
  • amistre64
16 -32 -6 --------- = 5 5 1
amistre64
  • amistre64
6(5) = 30 s000 (16-32-30)/5
amistre64
  • amistre64
-46/5
amistre64
  • amistre64
makes sense?
anonymous
  • anonymous
yeah
Denise
  • Denise
k
Denise
  • Denise
where did the 6(5) come from???
anonymous
  • anonymous
cz u take the lcm while subtracting
Denise
  • Denise
to get the 30
amistre64
  • amistre64
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
Denise
  • Denise
lol!

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