Write in the form .

Answer and explanation

Correct answer: A.

  1. Step 1: Find the largest square factor of 72, which is 36: .
  2. Step 2: So .
Answer
.
Why not the others: would equal , would equal and forgets to take the square root of 36.

Practise more Number, Surds, Indices and Bounds.

Free questions with an explanation for every one, and full timed UK GCSE mock tests.

All Number, Surds, Indices and Bounds questionsTake a mock test

More Number, Surds, Indices and Bounds questions