Suppose a parabola has vertex (–4, 7) and also passes through the point (–3, 8). Write the equation of the parabola in vertex form.
I NEED STEP BY STEP IM GIVING MEDALS AND FANNING

Question

Suppose a parabola has vertex (–4, 7) and also passes through the point (–3, 8). Write the equation of the parabola in vertex form.
I NEED STEP BY STEP IM GIVING MEDALS AND FANNING

anonymous · Answer

step by step?

anonymous · Answer

first write in vertex form as 
$$y=a(x-h)^2++k$$you know $h=-4,k=7$ and all you need is $a$

anonymous · Answer

lol with only one plus sign 
$$y=a(x-h)^2+k$$ what you get when you substitute?

anonymous · Answer

if it is not clear, let me know and i will show you

anonymous · Answer

I ontnderstnad atall :(

anonymous · Answer

ok then i will help

anonymous · Answer

the vertex is $(-4,7)$ right?

anonymous · Answer

so if we replace $h$ by $-4$ and $k$ by $7$ in the expression 
$$y=a(x-h)^2+k$$ we get 
$$y=a(x-(-4))^2+7$$ or just 
$$y=a(x+4)^2+7$$

anonymous · Answer

how are we doing so far?  we are not done yet, but we are close

anonymous · Answer

okay I understand