Multivariable Calculus - Sphere

[Larrytsai]

Homework Statement

Find the equation of the sphere centered at (-7,6,7) with radius 2. Normalize your equations so that the coefficient of x^2 is 1.

Homework Equations

(x-xo)^2 + (y-yo)^2 + (z-zo)^2=r

The Attempt at a Solution

(x-(-7))^2 + (y-6)^2 + (z-7)^2 = 2

it saids to normalize my equation... and i do not understand what that means.

 

[ehild]

Homework Statement

Find the equation of the sphere centered at (-7,6,7) with radius 2. Normalize your equations so that the coefficient of x^2 is 1.

Homework Equations

(x-xo)^2 + (y-yo)^2 + (z-zo)^2=r

Check the equation. It is not right.

ehild

 

[Larrytsai]

oops i forgot the r^2 in n e case the formula is not my problem, I am having troubles understandanding the last part of the question.

 

[ehild]

The coefficient of x^2 is 1 already, as (x+7)^2= x^2 + 14x + 49.

ehild