Even with just one set, you so much! i will give brainliest and and good rating!

Step-by-step explanation:(x + y )^2

= (y + x) ^2 for all x,y€R.{(e.g. 2+3=3+2=5}

Also,

(-x - y)^2 = (-1(x + y))^2 = (-1)^2(x +y)^2

= (x + y)^2 { since (-1)^2 = 1}

Thus, (x+y)^2=(-x-y)^2=(y + x)^2.

Q.E.D

won't that be plagrisim thought?

step-by-step explanation:

1^3 + 2^3 + 3^3 +4^3 = (1+2+3+4)^2

step-by-step explanation:

i am only able to answer the first part. i am not sure about the second part. sorry