12. Let Rs = {0, 1, 2, 3, 4}. (a) Define f: R5→ R5 by ƒ(x) = x² + 4 (mod 5) for all x e R5. Write the inverse of ƒ as a set of ordered pairs and explain why f function. is not a (b) Define g: R5 → R5 by g(x) = x³ + 4 (mod 5) for all x e R5. Write the inverse of g as a set of ordered pairs and explain why g¯' is a function. (c) Is it possible to write a formula for g-(y), where y e R5? The answer to this question depends on whether or not is possible to define a cube root of elements of Rs. Recall that for a real number x, we define the

Advanced Engineering Mathematics
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ISBN:9780470458365
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Just need help on a and b
12. Let Rs = {0, 1, 2, 3, 4}.
(a) Define f: R5 R5 by f(x) = x² + 4 (mod 5) for all x e R5. Write
the inverse of f as a set of ordered pairs and explain why fis not a
function.
(b) Define g: R5 → R5 by g(x) = x³ + 4 (mod 5) for all x e R5. Write
the inverse of g as a set of ordered pairs and explain why g
-1
is a
function.
(c) Is it possible to write a formula for g(y), where y e R5? The answer
to this question depends on whether or not is possible to define a cube
root of elements of R5. Recall that for a real number x, we define the
cube root of x to the real number y such that y3 = x. That is,
y = Yx if and only if y3 = x.
Using this idea, is it possible to define the cube root of each number in
Zs? If so, what are 0, Vī, 2, V3, and 4.
(d) Now answer the question posed at the beginning of Part (c). If possible,
determine a formula for g(y) where g-1: R5 → R5.
Explorations and Activities
Transcribed Image Text:12. Let Rs = {0, 1, 2, 3, 4}. (a) Define f: R5 R5 by f(x) = x² + 4 (mod 5) for all x e R5. Write the inverse of f as a set of ordered pairs and explain why fis not a function. (b) Define g: R5 → R5 by g(x) = x³ + 4 (mod 5) for all x e R5. Write the inverse of g as a set of ordered pairs and explain why g -1 is a function. (c) Is it possible to write a formula for g(y), where y e R5? The answer to this question depends on whether or not is possible to define a cube root of elements of R5. Recall that for a real number x, we define the cube root of x to the real number y such that y3 = x. That is, y = Yx if and only if y3 = x. Using this idea, is it possible to define the cube root of each number in Zs? If so, what are 0, Vī, 2, V3, and 4. (d) Now answer the question posed at the beginning of Part (c). If possible, determine a formula for g(y) where g-1: R5 → R5. Explorations and Activities
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