anonymous
  • anonymous
Help MEDAL GIVEN !!!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
The roots of the equation \[2x^2 + 5x - 8 = 0\] are \[\alpha \] and \[\beta \]. Find the quadratic equations whose roots are : \[5\alpha + \frac{ 1 }{ \alpha }, 5\beta + \frac{ 1 }{ \beta } \]
anonymous
  • anonymous
@robtobey
Jhannybean
  • Jhannybean
Have you found the sum and product of them?

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anonymous
  • anonymous
no
anonymous
  • anonymous
I did this :
anonymous
  • anonymous
\[\alpha+\beta = \frac{ -5 }{ 2 } \] , \[\alpha \beta = \frac{ -8 }{ 2 } = -4\] New sum = \[5\alpha + \frac{ 1 }{ \alpha } + 5\beta + \frac{ 1 }{ \beta } \] I don't know what to do now
campbell_st
  • campbell_st
well why not make it \[\frac{5\alpha^2 + 1}{\alpha} + \frac{5\beta^2 + 1}{\beta}\]
Jhannybean
  • Jhannybean
Then you take the sum and product of that?
campbell_st
  • campbell_st
then get the common denominator and add the numerators
anonymous
  • anonymous
then for new product: \[(5\alpha + \frac{ 1 }{ \alpha })* (5\beta+\frac{ 1 }{ \beta })\] in the end I got the answer to be : \[8x^2 -95 - 786\]. which I believe is wrong :( !!!
Jhannybean
  • Jhannybean
then input the sum and product into \(\sf x^2 -(\text{sum of roots})x +(\text{product of roots})=0\)?
campbell_st
  • campbell_st
look at the sum of the roots this way \[5\alpha + 5 \beta = \frac{1}{\alpha} + \frac{1}{\beta} = 5(\alpha + \beta) + \frac{\alpha + \beta}{\alpha \beta}\] does that help
campbell_st
  • campbell_st
oops should read \[5 \alpha + 5 \beta + \frac{1}{\alpha} + \frac{1}{\beta}\]
anonymous
  • anonymous
ahh yes that does help very much .. cheers :)
anonymous
  • anonymous
so was I correct then ????
anonymous
  • anonymous
what did you guys get as your final answer???
campbell_st
  • campbell_st
5(-5/2) + (-5/2)/-4 = -100/8 + 5/8 = -95/8 so that seems correct
anonymous
  • anonymous
what about the product ... it seems way tooo big
campbell_st
  • campbell_st
as for the product I thought \[(5\alpha + \frac{1}{\alpha})(5\beta + \frac{1}{\beta} = 25\alpha \beta + \frac{5\alpha}{\beta} + \frac{5\beta}{\alpha} + \frac{1}{\alpha \beta}\]
campbell_st
  • campbell_st
which becomes \[25 \alpha \beta + \frac{5 \alpha^2 + 5\beta^2}{\alpha \beta} + \frac{1}{\alpha \beta}\] or \[25 \alpha \beta + \frac{5[(\alpha + \beta)^2 - 2 \alpha \beta]}{\alpha \beta} + \frac{1}{\alpha \beta}\]
campbell_st
  • campbell_st
so I think you need to be careful with the signs
anonymous
  • anonymous
tooo confusing wht do you get as finl answer ???
campbell_st
  • campbell_st
i got -4
anonymous
  • anonymous
ok ....
campbell_st
  • campbell_st
so if -b/a = -95/8 then c/a = -32/8 so a = 8, b = 95 and c -32 that's my best guess
anonymous
  • anonymous
I got something else

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