Mathematics 9709 · AS & A Level · Logarithmic and exponential functions

Logarithmic and exponential functions — practice question

By making the substitution $u = 3^x$.
(main)[5]

Find the solution of $3^x + 3^{2x} = 3^{3x}$, and give your answer correct to $3$ significant figures.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “State or deduce $1+u=u^2$” …

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