Need help with functions, please.

For each of the following bijective functions find the range S and the inverse:

a.) f : x |→ x² - 1 (x ∈R, x ≥ 0)

b.) f : x |→ (x + 1)² ((x ∈R, x ≤ -2)

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- Nov 15th 2009, 12:21 PMHellbentRange and inverse of bijective functions
Need help with functions, please.

For each of the following bijective functions find the range S and the inverse:

a.) f : x |→ x² - 1 (x ∈**R**, x ≥ 0)

b.) f : x |→ (x + 1)² ((x ∈**R**, x ≤ -2) - Nov 15th 2009, 05:10 PMpencil09
so, u wanna find the range from the function....

The simplest way is to write down/construct the graph from the function, the range of the is the interval of y-axis that fit the graph.

example:

http://hotmath.com/images/gt/lessons...1/parabola.gif

-**the range (S) for the graph is (0,inf)**

and to find the inverse from the function,

1)

let,

the objectives to arrange the function until you get the equation for x=...

........hope it help..........(Wink) - Nov 16th 2009, 04:52 AMHellbent
- Nov 16th 2009, 05:01 AMmr fantastic
- Nov 16th 2009, 05:14 AMRaoh
Hello (Happy)

so the range must be . - Nov 16th 2009, 05:16 AMHellbent
- Nov 16th 2009, 05:18 AMmr fantastic
- Nov 16th 2009, 05:18 AMHellbent
- Nov 16th 2009, 05:23 AMRaoh
Hello (Happy)

the geometric figure of is a parabola ,and since is a root...u know what to do (Wink) - Nov 16th 2009, 05:26 AMHellbent
- Nov 16th 2009, 05:32 AMRaoh
- Nov 16th 2009, 05:33 AMHellbent
- Nov 16th 2009, 05:36 AMRaoh
Yes(Nod),which means is a ROOT.

and hence the graph should be like this,

http://www4c.wolframalpha.com/Calcul...image/gif&s=62 - Nov 16th 2009, 05:41 AMHellbent
Do I follow the same steps with this one f : x |→ (x + 1)² (x ∈ R, x ≤ -2)?

- Nov 16th 2009, 05:52 AMRaoh
Yes the same steps(Nod)

therefore

(Wink)