Hello, i have just finished one of my A level papers, i think i aced it except for the first question, and any fluffy mistakes i made.

e^x +3e^-x = 4

solve it!

after the customery after test discussion there seemed to be a differant answer for each student, and in one special case 4.

Can anybody please solve this question for me, as its bugging me pretty badly.

Thank you