Question

Someone help please!!!
Describe the surface x^2 + z^2 = (3-cosy)^2

Answer 1

when you're confused with qustions like this, just ignore the 2 (or what ever number ) for a sec and focus on the graph, or value of y=3cos(x).
evaluate the problem at a point you've chosen.
for ex: let's pick x=0, so y = 3cos(0) = 3.
now without your +2, it'll be y = 3
if you added your 2, then it'll be y = 3+2 = 5

that makes the point 2 point higher on the y axis.... meaning it shifted the graph up by 2 units.

Answer 2

did you get it

Answer 3

i dont know why you're adding a 2 .. not sure where thats coming from @afridi11432