SOLUTION: Hello, I have completed these exercises about finding the domain and range. Are they correct? 3. y = 20 - 2x^2 Domain: (-∞, +∞) Range: (-∞, 20) 4. y = 25(-7x

Algebra ->  Functions -> SOLUTION: Hello, I have completed these exercises about finding the domain and range. Are they correct? 3. y = 20 - 2x^2 Domain: (-∞, +∞) Range: (-∞, 20) 4. y = 25(-7x      Log On


   

Question 1196203: Hello,
I have completed these exercises about finding the domain and range. Are they correct?
3. y = 20 - 2x^2
Domain: (-∞, +∞)
Range: (-∞, 20)


4. y = 25(-7x-4)^64
Domain: (-∞, ∞)
Range: (0, ∞)
Thank you so much,
Fernando
Answer by ikleyn(52754) About Me  (Show Source):
You can put this solution on YOUR website!
.

First part under  #3  should be corrected.   The range is  (-oo,20].

Second part under  #4  should be corrected,  too.   The range is  [0,oo).


The rest is  OK.