(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

For problems 1 and 2 determine if the quadratic opens up or down. Find the vertex. Find any intercepts and use these things to graph the quadratic equation.

2. Relevant equations

1. y=-3x^2+12x-9

2. y=2x^2+3x+2

3. The attempt at a solution

For number 1:

ok well i determined the parabola opens down becuase a(-3) is negitive. Hope i got that right.

Then i found thevertexby h=-b/2a becuase that will give me the x cordinate of the vertex so i did -12/2(-3) = 2. 2 is thex cordinateof the vertex so i put 2 into the original equation to get they cordinate

Y=-3(2)^2+12(2)+9=21 i get 21 as my Y Cordinate.

Now for the intercepts i had a friend help me with this and he said there are no y int for a parabola...he also to me to take the equation -3x^2+12x-9=0 set it to 0 like that.

Then he told me to divid by 3 and get x^2-4x+3=0 then factor to get x=3 and x= 1 and those are my x ints for the parabola is this correct? any help would be greaty apriciated

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Graphing Parabolas =/

**Physics Forums | Science Articles, Homework Help, Discussion**