Porisma

A hint to get started

A repeated zero and an exponential deduction

Without the use of a calculator, solve the inequality 1x+1≤x(1+x)\dfrac1x+1\leq x(1+x). marks

Hence, solve 1−e2x+e−x−ex≤01-e^{2x}+e^{-x}-e^x\leq0. marks

[2013/DHS/I/2]

CJC · Review Problems · Question 4

Move all terms to one side and identify zeros and forbidden denominator inputs before choosing intervals.

Read the worked solution