The following definite integral evaluates to
$$\int_{-\infty}^{0} e^ {-\left(\frac{x^2}{20} \right )}dx$$
Now, the given integral can be written as:
Since none of the options are equal to , the given options are incorrect. You can verify the result here: wolframalpha(Click to view)
The original answer, in case needed, can be obtained from what follows:
let put x = (20t)^{1/2} Equation become dx = ((5^{1/2})/t^{1/2})dt 5^{1/2}∫e^{-t}t^{-1/2}dt================== very famous gamma reduction 5^{1/2}pie^{1/2}