Rewrite the equation of the parabola in vertex form. y= x2 + 8x - 21

Step-by-step explanation:

we know that

The equation of a vertical parabola into vertex form is equal to

where

(h,k) is the vertex of the parabola

if a> 0 then the parabola open upward (vertex is a minimum)

if a< 0 then the parabola open downward (vertex is a maximum)

In this problem we have

Convert to vertex form

Complete the square

--------> equation in vertex form

The vertex is the point

the parabola open upward (vertex is a minimum)

y= -2x+4, have a great day

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