How Can I Solve Integration Problems in Mathematica?

[Nusc]

Homework Statement

I'm having problems interating the following function numerically using Mathematica.
efield := 10^15
ion := 10^-15
\[Epsilon] := 8.8541878176^-12
q:=1.60217648710^-19

Homework Equations

x2:= (1/2 - 1/(2*ion) Sqrt[ion^2 - (q^3*efield^2)/(\[Pi]*\[Epsilon])])
x1:= (1/2 + 1/(2*ion) Sqrt[ion^2 - (q^3*efield^2)/(\[Pi]*\[Epsilon])])
Integrate[(3/2)*
Sqrt[1 - q^3*
efield*x^(-1)/(4*\[Pi]*\[Epsilon]) - x], {x,
x1, x2}]

The Attempt at a Solution

I receive the following error message:
Integrate::ilim: "Invalid integration variable or limit(s) in \
{1000000000000000000000000000000\ 1.60218^(19\\:2212)\ \
x,1/2-500<<8>>0000\ <<1>>,1/2+500000000000000 \
Sqrt[1/(100<<25>>000)-<<1>>]}"

I hate computers

 

[EnumaElish]

M. version 6.0.1.0 yields -3.85436*10^36 - 1.25626*10^44 \[ImaginaryI]

 

[tacman]

!

It looks like there may be an issue with the limits of integration you have chosen. It's possible that they are too large for Mathematica to handle. You may want to try adjusting them and see if that helps. Additionally, make sure all of your units are consistent and that you have included all necessary parentheses in your code. Sometimes small errors like that can lead to unexpected results. Keep trying, and don't give up! Computers can be frustrating, but they are also incredibly powerful tools for solving complex problems like this one. Keep at it and you'll get it eventually.