Question

Why is it ±3 and not 3?

I need full explaination.

I'll mark brainliest to the best.

Answer 1

(x-y)² must be equal to 9 and square of -3 and 3 is 9

Answer 2

it my means that x can be +3+y or -3+y

and also for y it can be +3-x or -3-x

it means there are two solutions of x and y
.....