Question

Find the domain...
Please help! :(

Answer 1

Maximum point ( 10, 5 )
Thus domain = all real, range <= 5

Answer 2

Domain values for a function are all the possible x-values.
Range values for a function are all the possible y-values.

When plugging this function into a graphing calculator it becomes easy to see..
The domain for a quadratic function is all real numbers.
This parabola opens down. The y-value of the vertex is the highest possible y-value. Here it is 5. Since the parabola opens down the range is then \[y \le5\]

Hope this helps! :)