Using Exercise 16, prove that the perpendicular bisectors of the sides of a triangle have a common point. (Hint: If : R2 R2 is rotation through an angle /2 counterclockwise, show that D(x, (y)) = x y.)

MATH121 Chapter 7 Notes Lesson 7.1 – Exponential Functions and their Graphs EXAMPLE 1. x 16 – 4 = 0 (First, we need to get the nomial with the exponent on a side by itself, so add 4 to both sides.) x 6 = 4 (Now, we need to get both numbers with the same base so we can set the exponents equal to one another. 16 is the same as 2 . 4 is the same as 2 .) 4x