Ask your own question, for FREE!
Mathematics 19 Online
OpenStudy (el_arrow):

Need help with definite integral problem

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

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

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

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

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

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):

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

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

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

OpenStudy (zarkon):

what is the area of the red in the pic I attached?

OpenStudy (el_arrow):

2

OpenStudy (zarkon):

no

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!