Answer:
A circle has an infinite amount of symmetry
No because 22 squared plus 24 squared does not = 26 squared
Please see the attached graph to see f(x) = (x - 3) ^2 +5 graphed.
Simply distribute the -3 across the b and -7.
-3(b - 7) = (-3 * b) + (-3 * -7) = -3b + 21
Hope this was helpful, if it wasn't just drop me a DM explaining what didn't make sense.