Answer:
Step-by-step explanation:
f(x)=2x²+4x-1
=2(x²+2x+1-1)-1
=2(x²+2x+1)-2-1
=2(x+1)²-3
domain: all real values
Range:[-3,∞)
Answer: I think it's the first one.
The missing number would be 100.
e.g 400/2= 200
200/2= 100
100/2 = 50
50/2 = 25
5x-20 should be the correct answer