Please help me with acellus

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)