Question

9n²+25 factorise the following

Answer 1

3n×3n+5×5. Measure is the product of n into n
9is the product of 3 into 3 .
The variable 25 is the square of 5

Answer 2

9n^2+25
=(3n)2 +(5)^2
=(3n+5)(3n-5)
I hope this answer is right