Hello :
y = 3x²+9x
= 3(x² + 3x )
= 3 ( x² +2(3/2)x +(3/2)²) -(3/2)²)
= 3((x+3/2)² -9/4)
y = 3 (x+3/2)² -27/4
<span>the x-coordinate of the vertex is : - 3/2</span>
As you can see, every time x increases by 2, y decreases by 5.
So, we have
-[4] [2] [-4] [-8]
mark me brainliest if i right ty :))
Plug 8 into the equation for y and you get 2+24 or 26.
A
Explanation-
Domain is the X, which is also independent. So you look at the first circle, or in more detail, the circle that has arrows pointing AWAY from it.
