Which quadratic function has an inverse?
A)
f(x) = x2 + 3, x ≤ 0
B)
f(x) = x2 + 3, x ≤ 4
C)
f(x) = x2 + 3, x ≥ -1
D)
f(x) = x2 + 3, x ≥ ∞

And how to do it plz

Question

Which quadratic function has an inverse?
A)
f(x) = x2 + 3, x ≤ 0	
B)
f(x) = x2 + 3, x ≤ 4	
C)
f(x) = x2 + 3, x ≥ -1	
D)
f(x) = x2 + 3, x ≥ ∞

And how to do it plz

anonymous · Answer

Answer is B

anonymous · Answer

thanks!

anonymous · Answer

To find the inverse of a function you first have switch the domain and range

anonymous · Answer

y = x^2 + 3
switch the y and x to get 
x = y^2 + 3

anonymous · Answer

solve for x and you get $$y = \sqrt{x - 3}$$ where $$x \ge 3$$

anonymous · Answer

so you solve and youll get the inverse

anonymous · Answer

oh okay

anonymous · Answer

it cant be A or C because x≥3, and it cant be D because nothing is greater than infinity or equal to infinity other than infinity

anonymous · Answer

alright, thank you i did this a few months ago, probally why i dont remember, thanks again!