Define the function f: R → R by f(x) To prove that f is onto, we need the following: = x³ +7 \x € R. Show that for every real number y, we can find at least one real number x such that f(x) =y. Our choice of x is: ✓y+7 Show that for every real number y, we can find at least one real number x such that f(x)=y. Our choice of x is: 3/y−7 Show that for all real numbers s and t, if f(s) = f(t) then s=t The given function is not onto. Take y= 0 has no pre-image that is a real number.
Define the function f: R → R by f(x) To prove that f is onto, we need the following: = x³ +7 \x € R. Show that for every real number y, we can find at least one real number x such that f(x) =y. Our choice of x is: ✓y+7 Show that for every real number y, we can find at least one real number x such that f(x)=y. Our choice of x is: 3/y−7 Show that for all real numbers s and t, if f(s) = f(t) then s=t The given function is not onto. Take y= 0 has no pre-image that is a real number.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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
Transcribed Image Text:Define the function f: R → R by f(x)
To prove that f is onto, we need the following:
=
x³ + 7 \x € R.
Show that for every real number y, we can find at least one real number x such
that f(x) =y. Our choice of x is:
✓y+7
Show that for every real number y, we can find at least one real number x such
that f(x)=y. Our choice of x is:
3/y−7
Show that for all real numbers s and t, if f(s) = f(t) then s=t
The given function is not onto. Take y= 0 has no pre-image that is a real number.
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