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Need help here, please.

Identify the vertex of y = x2 + 4x + 5.

A. (0,0)
B. (–2,9)
C. (–2,1)
D. (4,5)

1 Answer

6 votes

Answer:

Option C is correct.

Explanation:

y = x^2+4x+5

We need to find the vertex of the above equation.

The above equation represents the parabola.

The slope of parabola can be found by taking derivative of the given equation

dy/dx = 2x+4

The slope of the parabola at the vertex is zero SO,

2x+4 = 0

2x = -4

x = -4/2

x = -2

Putting value of x =-2 to find the value of y

y = x^2+4x+5

y =(-2)^2+4(-2)+5

y = 4-8+5

y =9-8

y = 1

So, the vertex is (-2,1)

Option C is correct.

User Xpapad
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