Question

If x + y = 18 and x = 72, what will be the value of (x 2) + (y2)?​

Answer 1

x+y= 18

x=72

72+y=18

y=18-72

y= -54

now, x^2+y^2

(72)^2+(-54)^2

72^2 - 54^2

5184-2916

2268