What is the vertices x^2-x-20 ?

The vertices x^2-x-20 is Minimum (1/2 ,-81/4)

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vertices x^2-x-20

vertices

x^{2} - x - 20

Minimum (\frac{1}{2}, - \frac{81}{4})

Solution steps

y = x^{2} - x - 20

The parabola parameters are:

a = 1, b = - 1, c = - 20

x_{v} = - \frac{b}{2 a}

x_{v} = - \frac{( - 1 )}{2 \cdot 1}

Simplify

x_{v} = \frac{1}{2}

Plug in

x_{v} = \frac{1}{2}

to find the

y_{v}

value

y_{v} = - \frac{81}{4}

Therefore the parabola vertex is

(\frac{1}{2}, - \frac{81}{4})

a < 0,

then the vertex is a maximum value

a > 0,

then the vertex is a minimum value

a = 1

Minimum (\frac{1}{2}, - \frac{81}{4})

x^{2} - 8 x + 9

x^{2} - 8 x + 7

x^{2} + 16

y = x^{2} + 4 x

f (x) = (x - 4)^{2} - 3