Can someone explain this for me : ) when you multiply a difference of two squares, why is your answer a binomial instead of a trinomial like when you multiply the sum of two squares?

Four equations are shown below. equation 1: y=2*equation 2: y=2x-5equation 3: y=x2 + 6equation 4: tdentify one linear equation and one nonlinear equation from the list. why each equation you identified is linear or nonlinear. nd one nonlinear equation from the list. state a reasonlinear equation