u/FinalxPain

When I'm solving I keep thinking "could I skip this step" in several questions, so for example, if I'm substituting limits in a definite integral but there are a lot of variables in exponent functions like [(1/2)x²e^2x - xe^2x] with 1 and 3 as the limits. Do I have to show 2(3) or can I right 6 immediately. Things like that are fine to skip or I have to write every single step? Pretty much any simple algebra that can be done mentally or on calculator (without question saying "use algebra to")