la-b2a-to-find-the-vertex-of-y-x2-4x-1-show-the-calculation-for-both-coordinates

Question

Use the axis-of-symmetry formula xv=−b2ax_{v}=-\frac{b}{2a} to find the vertex of y=−x2+4x+1y=$$-x^2+4x+1.$$

Accepted Answer

(2,5)(2, 5)

Answer

(4,1)(4, 1)

Answer

(−2,−5)(−2, −5)

Answer

(2,−5)(2, −5)

Use the axis-of-symmetry formula xv=−b2ax_{v}=-\(\frac{b}{2a}\) to find the vertex of y=−x2+4x+1y=-x^2+4x+1.