Dodo1
PLease Help me with intergals
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Dodo1
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Luigi0210
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\[\int\limits_{7}^{8}f(x)=-8 \]
I think..
Luigi0210
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|dw:1366155033606:dw|
Dodo1
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Thank you i entred it and your answer was correct!
Dodo1
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how did you get this?
Luigi0210
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Well I used the given information and graphed it out
I graphed each integral individually
Luigi0210
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And they gave the over value from 6-9 which is 6
So I added up both integral values: 14-x=6
Dodo1
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I see. what about the second one?
Luigi0210
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It would be the opposite.. since it's going backwards whenever the integral has a lower limit that is higher than the upper limit it'll be negative
\[\int\limits_{8}^{7}f(x)dx=-\int\limits_{7}^{8}f(x)dx\]
Luigi0210
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So it's -(-8)=8
Luigi0210
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Does that make some sense? :l
Dodo1
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the second one is wrong when I entred it
Luigi0210
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Woops, I did not see that 6..
Luigi0210
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\[-\int\limits_{7}^{8} 6(-8)-6\]
so it's 54 if I'm not mistaken again :/
Dodo1
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correct! you are supre. could you explain?
Luigi0210
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How I obtained the answer?
Dodo1
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yes,
Luigi0210
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Well since we know that: \[\int\limits_{7}^{8}f(x)dx=8\]
We can switch the integrals around and we already solved for \[\int\limits_{7}^{8}f(x)dx \]
we just plug in 8 for \[-\int\limits_{7}^{8}6f(x)-6\]
Luigi0210
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so it'll be -[6(-8)-6]
-[-48-6]
-[-54]
54
Luigi0210
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sorry i meant -8 on the first integral
Dodo1
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thank you so much