ijohnh14
ijohnh14 ijohnh14
  • 24-04-2018
  • Mathematics
contestada

can someone please explain this to me!

can someone please explain this to me class=

Respuesta :

ktreyb
ktreyb ktreyb
  • 24-04-2018
This quadratic polynomial is set up in the format:

Ax² + Bx + C = y

To find the vertex, we first find the X-value. To find this you use the formula:

X = - B / 2A

Now plug in using the given information and the formula.

X = - 6 / 2(- 3)

Simplify

X = - 6 / - 6
X = 1

Now take this X-value and plug it into the original polynomial to find the Y-value.

y = - 3(1)² + 6(1) - 4

Simplify

y = - 3(1) + 6 - 4
y = - 3 + 6 - 4
y = 3 - 4
y = - 1

So your vertex is (1, -1) or the second option. 
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