Question

In this problem, how did the symbol of plus minus came??​

Answer 1

Hie!!

In given Question it is clearly written that A and B are two friend with their age difference of 2.

let the age of A be x and let the age of B be y

| ( x - y ) | = 2

Where || is Magnitude of x - y . we Take the magnitude of x - y becoz we know that age can't be negative.

{ 2 , x > y }

| ( x - y ) | =

{ - 2 , x < y }

In general ( x - y ) = ±2 Either x < y or x > y.

Answer 2

Answer:

see the attachment.............