Given the formula X=x to the power of 2 + y to the power of 2 can you find X if x=9,y=negative 4,z=1/2?

Answer 1

I see
X = x^2 + y^2 , and x=9 , y=-4 and z = 1/2
X = 81+16 = 97

where does z enter the picture?

Answer 2

I Don't know, it was our teacher who typed the questions.