What is the equation of a parabola with a vertex of (5,-2) and point of (6,1)? Include "y=" as part of your answer. 

llltkl | Student

The equation of a parabola in vertex form is `y=a(x-h)^2+k` where (h,k) is the vertex.

Here, vertex is (5,-2)

We also have a point (x,y) = (6,1). So let's plug these in and find 'a'.


`rArr 1=a(1)^2-2`

`rArr 1=a-2`

`rArr a=3`

Here a is positive so the parabola opens upwards like a regular "U".

Now, rewrite the equation `y=a(x-h)^2+k`

Substituting a=3, h=5 and k=-2 we get:


`rArr y=3(x^2-10x+25)-2`

`rArr y=3x^2-30x+75-2`

`rArr y=3x^2-30x+73`

Therefore, the equation of the parabola is `y=3x^2-30x+73`