Integration by substitution is not required because it is only a linear function within the beacket. Simply integrate as normal then divide by the derivative of the bracket.
∫ e ^ (2 - x) dx
e ^ (2 - x) / -1 + C
-e ^ (2 - x) + C
reframe the question as
int e^(2-x) = - int -e^(2-x)
put
(2-x) as t therefore, -xdx = dt
= - int e^t dt
= - e^t
= - e^(2-x)
= e^2 * e^-x
Integrating it
= e^2 * (- e^-x)
= -(e^2 * e^-x)
Hope this will help
e^(2-x)=e^2(e^(-x))
int(e^2(e^-x))=e^2int(e^(-x))
=e^2*-e^(-x)
=-e^(2-x)
Comments
Integration by substitution is not required because it is only a linear function within the beacket. Simply integrate as normal then divide by the derivative of the bracket.
∫ e ^ (2 - x) dx
e ^ (2 - x) / -1 + C
-e ^ (2 - x) + C
reframe the question as
int e^(2-x) = - int -e^(2-x)
put
(2-x) as t therefore, -xdx = dt
= - int e^t dt
= - e^t
= - e^(2-x)
= e^2 * e^-x
Integrating it
= e^2 * (- e^-x)
= -(e^2 * e^-x)
Hope this will help
e^(2-x)=e^2(e^(-x))
int(e^2(e^-x))=e^2int(e^(-x))
=e^2*-e^(-x)
=-e^(2-x)