Orthogonally diagonalize the matrices in Exercises 110 by finding an orthogonal matrix Q and a diagonal matrix D such that QT AQ D.

L13 - 8 Now You Try It (NYTI): 2 1. Find all points P on the parabola y = x such that the tangent line at P passes through the point (2,−5). f(x) − f(a) 2. Use the limit deﬁnition of derivative at a point, f (a)=l m ,o ▯ x→a x − a calculate f (0) for the continuous function f(x)= x|x|.