How would I do this and work it out ? Only 15-17 please help me !!

Answer:
u need to find the square root, I hope u can understand I'm really bad at explaining
Step-by-step explanation:
so the symbols around the number means square root of...I'll give u an example
square root of 4
so 2×2=4, the square root has to be the same number like 2 and 2
if u need to find the square root u can multiply the numbers such as..
1x1
2x2
3x3
4x4
5x5
6x6
7x7
8x8
9x8 etc.
unlit u find the square root of any number. if u find the closest number but it's not quite the square root u can use decimals as well!
as I said I am terrible at explaining so let me know if u need any clarification