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>

8 0

3 years ago

Read 2 more answers

Write the equation of a line with a slope of -1 passing through the point (0,5)

elixir [45]

$The\ slope-intercept\ form\ of\ the\ line:y=mx+b\\\\m-the\ slope\\b-y-intercept\\\\m=-1;\ (0;\ 5)\to b=5\\\\Answer:\boxed{y=-x+5}$

8 0

3 years ago

This 2 questions pls help

lesantik [10]

Answer:

For the first picture: the answers A

For the second picture: it is also A

Step-by-step explanation:

I put each fraction into desmos for the second picture and the one that matched the image was A.

For the first image i picked A because 10 is a constant without a variable and is not a coefficient.

5 0

3 years ago