vertices y=x^2-6x+8

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vertices y=x²−6x+8

Solution

Minimum (3, −1)

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Find vertex using polynomial form

Find vertex using parabola form

Find vertex using vertex form

Find vertex using averaging the zeros

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y=x²−6x+8

Parabola equation in polynomial form

The vertex of an up-down facing parabola of the form y=ax²+bx+c is x_v=−b2a

The parabola parameters are:

a=1, b=−6, c=8

x_v=−b2a

x_v=−(−6)2· 1

Simplify

x_v=3

Plug in x_v=3 to find the y_v value

y_v=−1

Therefore the parabola vertex is

(3, −1)

If a<0, then the vertex is a maximum value
If a>0, then the vertex is a minimum value
a=1

Minimum (3, −1)

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Solve by: Find vertex using parabola form

Solve by: Find vertex using vertex form

Solve by: Find vertex using averaging the zeros

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−▭▭	<	7	8	9	÷	`AC`
+▭▭	>	4	5	6	×	☐☐☐
×▭▭	(	1	2	3	−	`x`
▭ \|▭	)	.	0	=	+	`y`

vertices y=x^2-6x+8

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