I need help answering these problems. If anyone can help me it would be greatly appreciated! Thank you!

Solve the Equation

1.x^2/3+5X^1/3+4+0

A.plus or minus 3i and plus or minus square root of 3

B. 3, square root of 3

C. plus or minus 3, plus or minus i square root of 3

d.plus or minus 3

2.If f(x)+2x^2+x and g(x)+2x-l, what is [f o g](x)?

A.2x^2-7x+6

B. 2x^2-7x+8

C. 2x^2-3x+2

D. x^2-3x+6