When you are given a quadratic equation such as x² + 8x + 12, how do you find the axis of symmetry and the vertex of the parabola and how do they relate to each other?

Francis is getting new carpet tiles in his living room and den. his living room and den are connected. he needs to figure out how much carpet he needs and the cost involved. if each tile costs $2.00 per sq ft, how much would it cost to have new tile put in the den? a) $24 b) $36 c) $48 d) $54 plz awnser soon