Question

50 points help below

Answer 1

(a)

`(2)/(3)x^2+1=55`

`(2)/(3)x^2=54`

`(2)/(3)x^2=54*(3)/(2)=81`

`\pm 9`

Answer: x=-9 or 9

(b)

`-2y^3-5=49`

`-2y^3=54`

`y^3=54/(-2)=-27`

`y=(-27)^(1/3)=-3`

Answer: y=-3 (only real root)