May someone help me with this problem? :)
(What is the a value of the following function?)

Question

dumbsearch2 · Answer

attachment

hartnn · Answer

a function cannot have a value.

a function can have a value AT A POINT,
like that function has the value of y = 2 at x=1

dumbsearch2 · Answer

Well this is the question... @hartnn It confused me, too!!

dumbsearch2 · Answer

I think it says the "A VALUE", not a value. @hartnn

dumbsearch2 · Answer

Maybe that's more specific.

ganeshie8 · Answer

it is asking for value of `a` i think

dumbsearch2 · Answer

Yea ^

hartnn · Answer

"a" value ? what does it even mean ?

ganeshie8 · Answer

it should have highlighted/boldfaced $a$

ganeshie8 · Answer

guess it is referring to $\large  y = a(x-h)^2 + k$

hartnn · Answer

the vertex form! ohh

ganeshie8 · Answer

since vertex is at origin,
$$\large  y = ax^2$$

ganeshie8 · Answer

pick any point on the parabola and plugin above ^^

dumbsearch2 · Answer

8=a*-2^2 ?

ganeshie8 · Answer

that works !

8=a*(-2)^2

solve `a`

dumbsearch2 · Answer

it gets -2, not one of the answers

ganeshie8 · Answer

$\large   y = ax^2$


plugin x = -2, y = 8, you get :

$\large  8 =  a(-2)^2$

ganeshie8 · Answer

$\large  8 =  a*4$

dumbsearch2 · Answer

ohhh so its 2? :)

ganeshie8 · Answer

yep!