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Mathematics 14 Online
AnimeGhoul8863:

i need a unique parabola equation

AnimeGhoul8863:

@Vocaloid

AnimeGhoul8863:

@dude

dude:

It can be any parabolic equation?

AnimeGhoul8863:

yes but can u make it fairly easy

dude:

(x+2)(x+7)

AnimeGhoul8863:

thats it i thought thats the parabola once its factored

dude:

I mean you can also do \((x+7)^2\)

AnimeGhoul8863:

for example on a quiz i took it says The equation f(x) = 3x2 − 24x + 8 represents a parabola.

AnimeGhoul8863:

wouldnt the parabola be a f(x) equation

dude:

Ah

dude:

f(x) just means y, so that doesnt matter

AnimeGhoul8863:

ok but im still confused on how what u gave me is a parabola

dude:

This is what I gave you https://www.desmos.com/calculator/lnh2sd5siy

AnimeGhoul8863:

ok and with this how do i find the y intercept and the zeros

dude:

Do you have to find the y-intercept and the zeroes algebraically? or can you do it graphically?

AnimeGhoul8863:

i need to have the numbers and then a picture of the graph for the equation

AnimeGhoul8863:

the points i see are (-7,0) (-2,0) and (-4.5,-6.25)

dude:

(-7,0) (-2,0) Are the zeroes ;p (-4.5,-6.25) is the vertex

AnimeGhoul8863:

ok but what is the y intercept

AnimeGhoul8863:

it says that the parabola needs to be in f(x) = ax2 + bx + c. form how do i put (x+2) (x+7) in that form

dude:

https://www.desmos.com/calculator/9wnragacbn is the y-intercept

dude:

Oh you have to distribute \((x+2)(x+7)\) =>\(x^2+9x+14\)

AnimeGhoul8863:

so it would be f(x)=x^2+9x+14

dude:

Right

AnimeGhoul8863:

ok now it said describe the direction that it goes

dude:

Well the graph should explain that :P Does it curve upward or downward?

AnimeGhoul8863:

it curves upward because

AnimeGhoul8863:

the parabola equation uses positive numbers at the end

dude:

not quite, the `a` value in the equation determines its curve \(f(x)=ax+bx+c\) If `a` is positive then it curves up If `a` is negative it curves down

AnimeGhoul8863:

so it curves up because a is positive

dude:

Yes

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