Find the equation, (f(x) = a(x - h)2 + k), for a parabola containing point (2, -1) and having (4, -3) as a vertex. What is the standard form of the equation?

Respuesta :

Given that the vertex of the parabola is (4,-3)

The parabola passes through the point (2,-1)

We need to determine the standard form of the equation of the parabola.

Standard form of the equation of the parabola:

The standard form of the equation is [tex]y=a(x-h)^2+k[/tex] where the vertex is (h,k) and a is the constant.

Substituting the vertex (4,-3) in the above equation, we get;

[tex]y=a(x-4)^2-3[/tex]  ---------------(1)

Substituting the point (2,-1) in the above equation, we have;

[tex]-1=a(2-4)^2-3[/tex]

[tex]-1=a(-2)^2-3[/tex]

[tex]-1=4a-3[/tex]

  [tex]2=4a[/tex]

  [tex]\frac{1}{2}=a[/tex]

Thus, the value of a is [tex]\frac{1}{2}[/tex]

Substituting the value of a in the equation (1), we get;

[tex]y=\frac{1}{2}(x-4)^2-3[/tex]

Thus, the standard form of the equation of the parabola is [tex]y=\frac{1}{2}(x-4)^2-3[/tex]

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