Question

a^3=5/2 got help and they said it was cuberoot20/2 but i don't get why.

Answer 1

What is the exact question that u have??

Answer 2

2a^6-3a^3-5=0

Answer 3

let u=a^3,
2u^2-3u-5=0
(2u-5)(u+1)=0
u=5/2 or u=-1 which leads to
a^3=5/2 or a^3=-1
a=cuberoot(5/2) or a=-1

Answer 4

thanks! i got those answers but the answer sheet said cuberoot(20)/2 so i wasn't sure. thanks for answering!

Answer 5

welcome :)