... a and b are orthogonal, (perpendicular), or one of a and b are zero.26 1 2 1 22 4 68 10 1 2Figure 1. 11: Plots of f(x) = p(x)/q(x). 1. 6 HintsHint 1. 1area = constant ×diameter2.Hint 1. 2A ... vertices at (1, 1, 0), (3, 2, 1) , (2, 4, 1) and (1, 2, 5)?Hint, SolutionExercise 2.8What is the equation of the plane that passes through the points (1, 2, 3), (2, 3, 1) and (3, 1, 2)? What is ... from 1 to n and are called free indices.Example 2 .1. 1 Consider the matrix equation: A · x = b. We can write out the matrix and vectors explicitly.a 11 ··· a1n.........an1···...