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

Logarithmic and exponential functions — practice question

(i)[3]

Solve $|3x - 2| = 5$.

(ii)[2]

Hence, by using logarithms, solve the equation $|3 \times 5^y - 2| = 5$, with the answer accurate 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: “Squaring both sides gives a quadratic with three terms” …

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