this is wrong

use the product rule and remember you have an x in front where the derivative is 1 (and also, -x/x = -1)

this is fine. to get a more compact answer, factor out the e^(2x)

2: y=xe^(2x)

y'=x*2e^(2x)+e^2(x)

this is also wrong. remember that and use the product rule3: y=3x*log(x)

y'= 3x*1/(x*ln(10))+3*log(x) = 3x/(x*ln(10))+3*log(x) = 3/ln(10)+3*log(x)