who's good at algebra??

Question

anonymous · Answer

not that good

anonymous · Answer

did you pass algebra 1?

anonymous · Answer

yup

anonymous · Answer

Maybe I can help.  What do you need?

anonymous · Answer

asking me

anonymous · Answer

ill just post the questions will yall answer them?

anonymous · Answer

yes

anonymous · Answer

We're supposed to explain how to do them so that you learn.  Then you will be able to get the right answers on future tests.

anonymous · Answer

determine the direction in which this parabola opens 
y=2x*2-4x+5
up or down

anonymous · Answer

@jam333 agreeded

anonymous · Answer

I odnt understand it I just need the answer so I can finish this and pass please

the_fizicx99 · Answer

Look at the end behaviors,

The leading coefficient is positive and the degree is even so the parabola is going to open upward.

anonymous · Answer

koay ask them

the_fizicx99 · Answer

Wait is that y = $\ 2x^2 - 4x + 5$ ?

anonymous · Answer

yes

the_fizicx99 · Answer

Then yeah, it's just as I stated above.

anonymous · Answer

its an quadratic equcation u can factorise it or the formula

the_fizicx99 · Answer

Maybe this will help you http://prntscr.com/37ukw0

anonymous · Answer

vertex of y=2x*2-4x+5

anonymous · Answer

For the vertex, normally you would complete the square.  Do you know how to do that?
It becomes  2(x-1)^2 + 3.  This means that the vertex is at (1,3).

the_fizicx99 · Answer

The vertex can be found using $\ -(\dfrac{b}{2a}) $

2 is $\ a$ 
-4 is $\ b $

$\ \sf -(\dfrac{-4}{2(2)}) \longrightarrow -(\dfrac{-4}{4}) = \dfrac{4}{4} = 1$

Now plug in 1 into f(x) = $\ 2x^2 - 4x + 5$

f(1) = 2(1)^2 - 4(1) + 5 = ??

$\ \sf \Large ~ Can ~ you~ solve ~ it? $

anonymous · Answer

so its (1,3)?

the_fizicx99 · Answer

$\ \sf \Large -(\dfrac{b}{2a})$ only applies to quadratic which means the degree of the polynomial is 2 (highest degree)

@catking  Yes the vertex is at (1,3)

anonymous · Answer

what is the axis of semmitry for that equsion

anonymous · Answer

Pretend you drew a big bowl on a piece of paper.  The axis of symmetry is like folding the paper so that the two sides look like a mirror image of each other.  If you folded along the y axis, it would not be correct.  You need to fold it up and down through the vertex.  So the line x = 1 would be the axis of symmetry.

anonymous · Answer

I have a lot more questions if your willing to help?

anonymous · Answer

determin the direction in which the parabola opens 
y=-2x*28x-15
up or down