Mathematics
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OpenStudy (anonymous):
ok one more for the night
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OpenStudy (anonymous):
are you answering questions or asking one?
OpenStudy (anonymous):
\[\left( \frac{x ^{2}-10x+16 }{ 4x-8} \right)\div \left( \frac{ x ^{2}-11x+24 }{2x ^{2}-18 } \right)\]
OpenStudy (anonymous):
asking i know you flip the second one
OpenStudy (anonymous):
oh sorry im asking too...but yes from what i know you flip the second one but im not sure how to multiple it out
hartnn (hartnn):
can u factor x^2-10x+16 ?
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OpenStudy (anonymous):
i get \[(x-8)(x-2)\]
hartnn (hartnn):
that is correct, now factor x^2-11x+24
OpenStudy (anonymous):
(x-8)(x-3)
hartnn (hartnn):
correct again!
what about 2x^2-18 ?
OpenStudy (anonymous):
thats wjere i get stuck i get
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hartnn (hartnn):
2x^2-18 = 2(x^2-9)
now ?
observe that it is difference of squares.
OpenStudy (anonymous):
so it breaks down to \[\left( 2(x ^{2}-9 \right)\]
hartnn (hartnn):
\(x^2-9 = x^2-3^2 = ? \)
use
\(\large a^2-b^2=(a+b)(a-b)\)
OpenStudy (anonymous):
(2x+3)(x-3)
hartnn (hartnn):
2 will remain outside
2(x+3)(x-3)
ok?
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hartnn (hartnn):
now put everything together, in the fraction form,
after flipping the 2nd one
OpenStudy (anonymous):
so what about the 4x-8
hartnn (hartnn):
factor out 4 from that
OpenStudy (anonymous):
4(x-8)
hartnn (hartnn):
4x-8 = 4x-4*2 = 4(x-2)
got this ?
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OpenStudy (anonymous):
\[\frac{ (x-8)(x-2) }{ 4(x-2) }\times \frac{ (2(x+3)(x-3) }{ (x-8)(x-3) }\]
OpenStudy (anonymous):
\[\frac{ 2x+3 }{ 4 }\]
hartnn (hartnn):
absolutely correct!
what gets cancelled out ?
hartnn (hartnn):
ok, again u missplaced the brackets
won't it be 2(x+3 ?)
hartnn (hartnn):
2(x+3)/4
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OpenStudy (anonymous):
oh yes \[\frac{ 2(x+3) }{ 4 }\]
hartnn (hartnn):
which gets simplified to ?
OpenStudy (anonymous):
\[\frac{ (x+3 }{ 1 }\]
hartnn (hartnn):
2/4=?
OpenStudy (anonymous):
\[\frac{ x+3 }{ 2 }\]
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hartnn (hartnn):
that is correct final answer :)
OpenStudy (anonymous):
o thank youuuuuuu soo much
hartnn (hartnn):
welcomeeeeeee soo much ^_^