Mathematics
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OpenStudy (el_arrow):
Need help with definite integral problem
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OpenStudy (el_arrow):
\[\int\limits_{0}^{2}\]
OpenStudy (el_arrow):
f(x)dx
OpenStudy (el_arrow):
its on a graph do you know how i can draw a graph to show you?
OpenStudy (zarkon):
|dw:1414636384866:dw|
OpenStudy (anonymous):
screen shot works nicely too
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OpenStudy (el_arrow):
can you read it?
OpenStudy (zarkon):
are the 124 supposed to be right there?
OpenStudy (anonymous):
i vote for a screenshot
OpenStudy (el_arrow):
yeah hold on i am making a better one in paint
OpenStudy (zarkon):
I prefer to use the snipping tool
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OpenStudy (el_arrow):
where is that at
OpenStudy (zarkon):
OpenStudy (el_arrow):
it suppose to be (2,3) and (3,3)
OpenStudy (zarkon):
you using windows?
OpenStudy (zarkon):
if so search for snipping
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OpenStudy (zarkon):
then you can highlight what you want to copy
OpenStudy (el_arrow):
i found it
OpenStudy (el_arrow):
OpenStudy (el_arrow):
ok got it
OpenStudy (el_arrow):
that what the graph looks like
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OpenStudy (zarkon):
the definite integral is juts the area under the curve. So make rectangles, triangles, trapezoids and find the area that way
OpenStudy (zarkon):
for example
|dw:1414637635465:dw|
OpenStudy (zarkon):
|dw:1414637666604:dw|
if I had the above I would make a trapezoid, rectangle and triangle and find the area of each
OpenStudy (el_arrow):
and what do i do after that
OpenStudy (zarkon):
add up the areas
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OpenStudy (zarkon):
note: if the graph lies below the x-axis then the area is negative
OpenStudy (el_arrow):
so add the lenght and the height of the triangle
OpenStudy (zarkon):
find the area of each of the objects created
OpenStudy (zarkon):
then add the areas
OpenStudy (el_arrow):
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OpenStudy (el_arrow):
like this for \[\int\limits_{0}^{2}\]
OpenStudy (zarkon):
you would have to include all the area that connects to the x-axis
OpenStudy (zarkon):
so you need to go down one more block
OpenStudy (zarkon):
and create a trapezoid
OpenStudy (el_arrow):
ok so the answer would be 4
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OpenStudy (zarkon):
yes
OpenStudy (el_arrow):
and what about for \[\int\limits_{0}^{5}\]
OpenStudy (zarkon):
continue what you are doing
go from 2 to 3
then from 3 to 5
OpenStudy (zarkon):
rectangle then triangle
OpenStudy (el_arrow):
i dont understand very well
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OpenStudy (zarkon):
OpenStudy (zarkon):
what is the area of the red?
OpenStudy (el_arrow):
so how would the answer be 10 then?
OpenStudy (zarkon):
we are working up to that
OpenStudy (zarkon):
piece by piece
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OpenStudy (zarkon):
what is the area of the red in the pic I attached?
OpenStudy (el_arrow):
2
OpenStudy (zarkon):
no