Answer:
Step-by-step explanation:
f(x)=(x²+20x+100) -3 because : 97 = 100 - 3
f(x) = (x+10)² -3 ....vertex form
I think x=-2
<em>Good luck, you'll need it :)</em>
The numbers are 5,30,15
10%-8%=2
2/8=0.25
0.25×100=25
The net percentage is 25%