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Mathematics 21 Online
OpenStudy (anonymous):

ok one more for the night

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 ?

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

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?

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 ?

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

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):

\[\frac{ x+3 }{ 2 }\]

hartnn (hartnn):

that is correct final answer :)

OpenStudy (anonymous):

o thank youuuuuuu soo much

hartnn (hartnn):

welcomeeeeeee soo much ^_^

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