Let x = (r1.12) E R? and y = (y.2) E R². i) Find a symmetric matrix A e M2.2(R) such that x" Ax = 1 + 4ry + y*. %3D i) Find a diagonal matrix De M22(R) and a rotation matrix QE M22(R) such that x Ax = y" Dy, where y = Q"x. 5) Explain why the equation x' Ax = 1 is an equation of a hyperbola.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter5: Orthogonality
Section5.4: Orthogonal Diagonalization Of Symmetric Matrices
Problem 27EQ
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3. а)
Let x = (1.12) e R² and y =
(1. 2) E R².
i) Find a symmetric matrix A E M22(R) such that
x" Ax = r + 4ry + y*.
ii) Find a diagonal matrix De M22(R) and a rotation matrix Q € M2.2(R) such that
x' Ax = y" Dy, where y = Q"x.
iii) Explain why the equation
x" Ax = 1
is an equation of a hyperbola.
iv) Find the canonical (yı, 92) coordinates of the tangent vectors to the asymptotes of
the hyperbola above. That is, find vectors uj and uz as shown on the fig 1.
v) Find the original (1.12) coordinates of the tangent vectors to the asymptotes of
the hyperbola above. That is, find vectors uj and uz as shown on the fig 1.
Transcribed Image Text:3. а) Let x = (1.12) e R² and y = (1. 2) E R². i) Find a symmetric matrix A E M22(R) such that x" Ax = r + 4ry + y*. ii) Find a diagonal matrix De M22(R) and a rotation matrix Q € M2.2(R) such that x' Ax = y" Dy, where y = Q"x. iii) Explain why the equation x" Ax = 1 is an equation of a hyperbola. iv) Find the canonical (yı, 92) coordinates of the tangent vectors to the asymptotes of the hyperbola above. That is, find vectors uj and uz as shown on the fig 1. v) Find the original (1.12) coordinates of the tangent vectors to the asymptotes of the hyperbola above. That is, find vectors uj and uz as shown on the fig 1.
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