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Start by identifying a, b, and c in the given equation.
y-intercept: 6
Axis of Symmetry: x=3
Vertex: (3, - 12)
Consider the general expression of a quadratic function, y=ax^2+ bx+ c, where a ≠0. Let's note three things we can learn from this equation.
We will start by identifying the values of a, b, and c.
f(x)=2x^2-12x+6 ⇕ f(x)=2x^2+( - 12)x+ 6
The equation of the axis of symmetry is x=3.
To find the vertex of the parabola, we will need to think of y as a function of x, y=f(x). We can write the expression for the vertex by stating the x- and y-coordinates in terms of a and b.
Vertex: ( - b/2a, f(- b/2a ) )
When determining the axis of symmetry, we found that - b2a=3. Therefore, the x-coordinate of the vertex is 3 and the y-coordinate is f(3). To find this value, substitute our x-coordinate for x in the given equation.
x= 3
Calculate power
(- a)b = - ab
Multiply
Add and subtract terms
The vertex of the parabola is (3,- 12).