Question 831332
let the number be x

sum of 522 and 3 times the number = 3x+522

square of a number = x^2

x^2-(3x+522)=126

x^2-3x-522=126

x^2-3x-648=0

x^2-27x+24x-648=0

x(x-27)+24(x-27)=0

(x-27)(x+24)=0

x=27  OR -24

But number is positive

the number is 27