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Between e, and f how do I know whether to use y= a(x-h)^2+k form, or ax^2 +bx +c form? And how do I work it out?
And how do I work out this one step by step?
to #3:Originally Posted by delicate_tears
Between e, and f how do I know whether to use y= a(x-h)^2+k form, or ax^2 +bx +c form? And how do I work it out?
And how do I work out this one step by step?
All points on the x-axis have the y-coordinate zero. Thus you know 2 points of the parabola:
P(-1, 4), Q(6, 0) . Plug in these coordinates into the given equation. You'll get a system of linear equations. Solve for a and b:
...... I've got
 = \left(\frac47, -\frac{24}{7}\right))
If you know the coordinates of the vertex the equation
Between e, and f how do I know whether to use y= a(x-h)^2+k form, or ax^2 +bx +c form? And how do I work it out?
...would be the best.
In both cases you know the coordinates of the vertex and the coordinates of one additional point. I'm going to do f so you can try to do e:
You know: V(2, 2) and P(0, 6). Plug in these coordinates:
. Thus your equation becomes:
^2+2)
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Quadratic Rules - h & k values
