xxImHisGirlxx
  • xxImHisGirlxx
help !
Mathematics
jamiebookeater
  • jamiebookeater
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xxImHisGirlxx
  • xxImHisGirlxx
What is the simplified form of each expression? 7x^-8 times 6x^3 42 over x^5 1 over 42x^5 42x^11 13x^-5 (-2x^8) times 3y^9 times 2x^4 3x^12y^9 -12x^72y^9 -12xy^21 -12x^12y^9
anonymous
  • anonymous
a negative exponential means it is actually 1/ the exponential \[7*\frac{ 1 }{ x ^{8} } * 6 * x ^{3} = 42 * \frac{ x^{3} }{ x^{8} }\]
xxImHisGirlxx
  • xxImHisGirlxx
i think c? for 1 and d for 2

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anonymous
  • anonymous
a) is 42 x ^5 ?
anonymous
  • anonymous
it is not c because one of the x exponents has a negative sign the other has a positive
xxImHisGirlxx
  • xxImHisGirlxx
so its a ?
anonymous
  • anonymous
yes, I believe it should be a)
xxImHisGirlxx
  • xxImHisGirlxx
and number 2?
anonymous
  • anonymous
\[42 * \frac{ x^{3} }{ x^{8} }\] you can cancel the three X above and are left with 42 over x^5
xxImHisGirlxx
  • xxImHisGirlxx
anonymous
  • anonymous
\[(-2x^8) \times 3y^9 \times 2x^4 = -4 x^{12} \times 3 y^9=-12 x^{12}y^9\] yes, d) for second one

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