(main)[5]
Solve $\frac{e^x + e^{-x}}{e^x + 1} = 4$, and give your answer correct to 3 decimal places.
Mathematics 9709 · AS & A Level · Logarithmic and exponential functions
Logarithmic and exponential functions — practice question
Using all necessary working, Solve the equation
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “After substitution, produce a quadratic with three terms, $3u^2+4u-1=0$, or an equivalent form.” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI