Although the integral `\int(2x+e)dx` looks like it may be complicated, the integrand is really just a polynomial, which means we can separate it into two different integrals, each of which is just a power rule.
`\int 2xdx+\int edx`
`=2 1/2 x^2+ex+C` notice that e is just a number, so this is the integral of a constant
Antiderivative means the integration.
f(x) = 2x+e
`intf(x)dx = int(2x+e)dx`
Therefore antiderivative f(x) = `x^2+ex+C ` where C is a constant.