Seudónimo Seudónimo
  • 13-02-2018
  • Mathematics
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50 points help below

50 points help below class=

Respuesta :

lancef837
lancef837 lancef837
  • 13-02-2018
a. is x equals 9
b. is -3  



Answer Link
mathmate
mathmate mathmate
  • 13-02-2018
(a)
[tex]\frac{2}{3}x^2+1=55[/tex]
[tex]\frac{2}{3}x^2=54[/tex]
[tex]\frac{2}{3}x^2=54*\frac{3}{2}=81[/tex]
[tex]\pm 9[/tex]

Answer: x=-9 or 9

(b)
[tex]-2y^3-5=49[/tex]
[tex]-2y^3=54[/tex]
[tex]y^3=54/(-2)=-27[/tex]
[tex]y=(-27)^(1/3)=-3[/tex]

Answer: y=-3   (only real root)
Answer Link

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