Answer:
2.6?:))))
......
f(x)=x^2+3
f(x+y)=(x+y)^2+3
this is done by replacing x with (x+y)
f(x+y)=x^2+2xy+y^2+3
therefore : f(x+y)= x^2+y^2+2xy+3
The domain is all real numbers
Step-by-step explanation:
In any infinite quadratic equation, the domain is all real numbers.
3
Hope this helps. :) :D
5
Apply Pythagorean theorem
