Step by step
The question
Question: work out √(16 + 9).
√16 + 9
1 Under the root sign
Order: ( ) → x² √ → × ÷ → + −
16 plus 9 is 25.
= √25
2 Square roots
√25 asks: which positive number times itself makes 25?
5 times 5 is 25.
5 × 5 = 25
So √25 is 5.
= 5
So the answer is 5.
Let's look back.
First: under the root sign.
Last: square roots.
Answer
= 5