Step by step
The question
Question: find the value of m² + n² when m = 3 and n = 4.
m2 + n2
m = 3, n = 4
1 Put the numbers in
We put 3 in place of m and 4 in place of n.
= 32 + 42
2 Powers
Powers come before plus.
Order: ( ) → x² √ → × ÷ → + −
3² means 3 times 3.
32 = 3 × 3 = 9
That is 9.
= 9 + 42
Powers come before plus.
4² means 4 times 4.
42 = 4 × 4 = 16
That is 16.
= 9 + 16
3 Plus and minus
9 plus 16 is 25.
= 25
So m² + n² is 25 when m = 3 and n = 4.
Let's look back.
First: put the numbers in.
Then: powers.
Last: plus and minus.
Answer
= 25