Simplify .
Answer and explanation
Correct answer: A.
- Step 1: Look for the largest square factor of 72, which is 36: .
- Step 2: , so the surd becomes .
Answer
.
Why not the others: : this takes the square root of 36 as 36 instead of 6. : this would square to 24, not 72. : this squares to 192, not 72.
Practise more Expressions, Formulae and Relationships.
Free questions with an explanation for every one, and full timed National 5 (Scotland) mock tests.