Well, looking at the graph, notice, its vertex is at 0,9, and it passes through the points -3,0 and 3,0, so hmm let's use 3,0, to get the equation of f(x)

Watch carefully:
A 'zero' of the function is a value of 'x' that makes the function zero.
2x - 10 = 0
Add 10 to each side:
2x = 10
Divide each side by 2 :
x = 5
f(5) = 0
Answer:
dont say you feel dumb we all need help
Step-by-step explanation:
Answer:
diameter is 4
Step-by-step explanation:
The answer is square root of 31. Attached is a picture with step by step explanation