anonymous
  • anonymous
Find all roots and check your answer 5x^3-23x=57x
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
5x^3 - 23x - 57x = 0 5x^3 - 80x = 0 x(5x^2 - 80) = 0 so x = 0 is one solution 5x^2 - 80 = 0 x^2 - 16 = 0 x = sqrt(16) so x = -4, +4 is two other solutions
anonymous
  • anonymous
can i ask you another one
anonymous
  • anonymous
ok

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anonymous
  • anonymous
2(x+15)=9x+2(x^2-15)
anonymous
  • anonymous
2x + 30 = 2x^2 - 30 + 9x moving to the right 2x^2 + 7x - 60 = 0 (2x + 15)(x - 4)
anonymous
  • anonymous
so the roots are 2x+15 and x-4
anonymous
  • anonymous
2x + 15 = 0 so one root is x = -15/2 x -4 = 0 so other root is x=4
anonymous
  • anonymous
oh ok thank you

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