Question 193683
(a+b)^2vs  a^2+b^2
but  (a+b)^2=(a+b)(a+b)=a^2+2ab+b^2=a^2+b^2+2ab
therefore  (a+b)^2  not  equal  a^2+b^2

for  example  let  a=3,,,,b=4
(3+4)^2  vs  3^2+4^2
7^2  vs  9+16
49  vs  25
definetly  not  equal