Question

If 25 is subtracted from a square of a positive integer the result is 200 find the positive integer

Answer 1

15

Explanation:

Put it as an equation with x the positive integer so you have

x²-25=200

add 25 on each side : x²=225

now
`x=√(225),\:x=-√(225)`

but x is positive so
`x=√(225)=15`