How can I create a function for binomial (a+b)^2?

Good morning, I'm a student of statistics and
I have to do this exercise : create a function for to calculate square of binomial.
I have written
binomio=function(z,y) {z^2+yz2+ y^2}
But this function isn't correct when z is unknown. For exemple when i want to calculate (x+2)^2 and I would like as a result (x^2+22x+2^2)
Please help me...It is one of the first times that I'm using R studio.

If I understand your question right, using the multiplication operator * between the variables may solve your problem.

binomio = function(z,y) {z^2+y*z*2+y^2}
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