Find a counterexample to show that the conjecture (x+y)^2=x^2+y^2 is false​

What can you say about the bisector of the vertex angle of an isosceles triangle?

In f(x) = 1/x , what happens to the value of the function if x = 0? does this value affect the domain of the function?

Jake brought a laptop worth 35 000 for personal use.suppose the value of the laptop depreciates by 5 250 annually , how much would be its value after 5 years? ​