Mathematics 0580 · IGCSE · Powers and roots

Powers and roots — practice question

(a)[2]

Simplify the expression $\sqrt{125}-\sqrt{20}$.

(b)[2]

Work out the value of $k$.

(c)[2]

Rationalise the denominator of $\frac{1}{\sqrt7+2}$.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Hence $3\sqrt5$.” …