Multivariable Calculus - Sphere

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SUMMARY

The equation of a sphere centered at (-7, 6, 7) with a radius of 2 is derived from the standard formula (x - x₀)² + (y - y₀)² + (z - z₀)² = r². Substituting the center and radius, the equation becomes (x + 7)² + (y - 6)² + (z - 7)² = 4. Normalization in this context means ensuring the coefficient of x² is 1, which is already satisfied in the derived equation. The final normalized equation is (x + 7)² + (y - 6)² + (z - 7)² = 4.

PREREQUISITES
  • Understanding of multivariable calculus concepts
  • Familiarity with the equation of a sphere
  • Knowledge of algebraic manipulation
  • Ability to normalize equations
NEXT STEPS
  • Study the derivation of the equation of a sphere in three-dimensional space
  • Learn about normalization techniques in algebra
  • Explore applications of spheres in multivariable calculus
  • Practice solving similar problems involving spheres and their equations
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Students studying multivariable calculus, educators teaching geometry, and anyone looking to enhance their understanding of spherical equations and normalization techniques.

Larrytsai
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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.
 
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Larrytsai said:

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

ehild
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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