vertex aka max or min point is found by -b/2a in form f(x)=ax^2+bx+c f(x)=-1x^2+8x+20 vertex x value is -8/(2)(-1)=-8/-2=4 input back to find y value f(4)=-(4^2)+8*4+20 f(4)=-16+32+20 f(4)=36 max (since the graph opens down) is (4,36) axis of symmetry is the x coordinate
