shaleiah
  • shaleiah
@Nnesha
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
katieb
  • katieb
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shaleiah
  • shaleiah
Please help walk me through this.
Nnesha
  • Nnesha
alright ready! :PD
Nnesha
  • Nnesha
|dw:1443039690740:dw|

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Nnesha
  • Nnesha
for the first part we need to find max in other words vertex point |dw:1443039751009:dw|
Nnesha
  • Nnesha
so use the formula to find c-coordinate of the vertex \[\huge\rm x=\frac{ -b }{ 2a }\] b=middle term a=leading coefficient
Nnesha
  • Nnesha
hmm 407 ??
shaleiah
  • shaleiah
Wait...
shaleiah
  • shaleiah
\[\frac{ 0.658 }{ 2(0.00407) }\]
Nnesha
  • Nnesha
don't forget the sign okay \[\frac{ -0.658 }{ 2(-0.00407) }\] now solve
shaleiah
  • shaleiah
80.83538084
Nnesha
  • Nnesha
something wrong i didn't get that o.O
shaleiah
  • shaleiah
I typed it in my ti-84 calculator, that's what I got..
Nnesha
  • Nnesha
try again put the parentheses
Nnesha
  • Nnesha
that's how you should type in ti 84 -(.658)/(2(-.000407))
shaleiah
  • shaleiah
\[-(\frac{ .658 }{ 2(-.000407) }= 808.3538084\]
Nnesha
  • Nnesha
yes right now that's x coordinate of vertex now substitute x for 808 to find y-coordinate into the original equation
IrishBoy123
  • IrishBoy123
|dw:1443040813328:dw|
Nnesha
  • Nnesha
what ?? o.O
Nnesha
  • Nnesha
hmm i mean \[y=-.000407x^2+.658x\] in this equation replace x with 808
shaleiah
  • shaleiah
265.948352
Nnesha
  • Nnesha
yes right we can round it so it would be 266 that would be the height
Nnesha
  • Nnesha
now for the 2nd part you need to find x-intercept(zeros ) of that quadratic equation
Nnesha
  • Nnesha
i'll like to use quadratic formula bec there are negative numbers
shaleiah
  • shaleiah
I'm not good at quadratic formulas:(
Nnesha
  • Nnesha
\[\huge\rm \frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\] quadratic formula a= leading coefficient b=middle term c=constant so justplugin
Nnesha
  • Nnesha
\[\huge\rm Ax^2+Bx+C\] quadratic equation a= leading coefficient b=middle term c=constant
shaleiah
  • shaleiah
\[\frac{ -.658 +\sqrt{.658^{2}-4(.00407)}}{ 2(266) }\]
Nnesha
  • Nnesha
don't forget the C which is 0 so 4ac would be 4(.000407)(0) and why did you replace a with 266 ?
Nnesha
  • Nnesha
the denominator is 2a so 2(????)
shaleiah
  • shaleiah
2(.000407)
Nnesha
  • Nnesha
yes right \[\frac{ -.658 +\sqrt{(.658)^{2}-4(.00407)(0)}}{ 2(.000407) }\] now oslve
Nnesha
  • Nnesha
solve**
shaleiah
  • shaleiah
Nnesha
  • Nnesha
please show you u got that that's not right you should get 2 solutions
shaleiah
  • shaleiah
I typed the equation directly in my ti-84 calculator
shaleiah
  • shaleiah
Do i solve them seperately?
Nnesha
  • Nnesha
hmm that wouldn't work how would you right plus minus sign in the calculator yes right solve the numerator the square root part
shaleiah
  • shaleiah
1.316
shaleiah
  • shaleiah
or .658?
Nnesha
  • Nnesha
both are wrong first solve square root \[\frac{ -.658 +\sqrt{\color{ReD}{(.658)^{2}-4(.00407)(0)}}}{ 2(.000407) }\] now just type the red part into the calculator
shaleiah
  • shaleiah
.432964
Nnesha
  • Nnesha
i just realized i'm the one who typed incorrectly sorry it's plus/minus \[\frac{ -.658 \pm \sqrt{\color{ReD}{(.43296)}}}{ 2(.000407) }\]
Nnesha
  • Nnesha
take the square root of .43296
shaleiah
  • shaleiah
oops
Nnesha
  • Nnesha
right so \[\huge\rm \frac{ -.658+6.58 }{ 2(-.000407) } and \frac{ -.658-.658 }{ 2(-.000407) }\] now we can seprate plus and minus sign and i found another typo a=negative .000407
shaleiah
  • shaleiah
.6579969605
Nnesha
  • Nnesha
that is same as .658 remember the number after 7 is greater than 5 so you can round it
Nnesha
  • Nnesha
this post is solaggy
shaleiah
  • shaleiah
yeah, lots of lag :(
Nnesha
  • Nnesha
\[\huge\rm \frac{ -.658+6.58 }{ 2(-.000407) } and \frac{ -.658-.658 }{ 2(-.000407) }\] alright work on this brb
shaleiah
  • shaleiah
Alright. I got 807545.4545
shaleiah
  • shaleiah
808
Nnesha
  • Nnesha
there are two fraction what did you get for first one what did you get for 2nd one
Nnesha
  • Nnesha
that doesn't looks right
Nnesha
  • Nnesha
use parenttheses
shaleiah
  • shaleiah
:c
Nnesha
  • Nnesha
what ?
shaleiah
  • shaleiah
are you sure the equation is set up correctly?
Nnesha
  • Nnesha
\[\huge\rm \frac{ -.658+6.58 }{ 2(-.000407) } and \frac{ -.658-.658 }{ 2(-.000407) }\] yes this one is 100% correct
shaleiah
  • shaleiah
The first fraction is: -7275... The second fraction is: -807545
Nnesha
  • Nnesha
ugh first fraction is .658 -.658 not (6.58) 2nd fraction is 100% right but no ur answer is not right for 2nd one
Nnesha
  • Nnesha
tell me what did you type into the calculator for first fraction
shaleiah
  • shaleiah
The 6.58 was the error :(
Nnesha
  • Nnesha
\[\huge\rm \frac{ -.658+.658 }{ 2(-.000407) } \] first one
shaleiah
  • shaleiah
0
Nnesha
  • Nnesha
right what about other one
Nnesha
  • Nnesha
hmm not correct what did you type into the caluclator ?
shaleiah
  • shaleiah
I'm sorry :/ I see the error. I re typed it and I got 1616.707617
Nnesha
  • Nnesha
yes that's right
shaleiah
  • shaleiah
Did we finish all the steps?
Nnesha
  • Nnesha
yep that's for 2nd part!
Nnesha
  • Nnesha
2nd one is `how long` so it would be 1616.71 0 wouldn't be the answer

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