Question

Simplify :( x2 + y2 +1)+( x2 + y2 -1)+( x2 – y2 +1)+( y2 + 1- x2)​

Answer 1

Answer:

(x2+y2+1)+(x2+y2-1)+(x2-y2+1)+(y2+1-x2)

x2+y2+1+x2+y2-1+x2-y2+1+y2+1-x2

x2-x2+x2+x2+y2+y2-y2+y2+1-1+1+1

2x2+2y2+2

2(x2+y2+1)

i hope it helps u