Thread: Need help solving for:

Factors of 6 are:
3,2
1,6
Factorizing then gives
If ,
or
Which part makes it confusing? Is it the ?

Originally Posted by Vuong

You could use quadratic to factor?

I believe I just did.

Originally Posted by Quacky

Factors of 6 are:
3,2
1,6
Factorizing then gives
If ,
or
Which part makes it confusing? Is it the ?

Yes, for that I just kept trying (6x + ) (x )

Sometimes, that will give you a solution, but you must consider the other possible ways of getting as well.

Factoring Quadratics
This website is rather babyish, but the explanations are clear, and it makes factorizing a lot easier.

How do I find the x intercepts of a problem like y=x^2-6x+25?

Originally Posted by Quacky

y=-4x^2-9x-2

Ok, the line will cut the y axis where x=0.
Substitute x=0 into the equation, and you get y=-2. So point of interception is at:
(0,-2)
Now, the line will cut the x axis where y=0. To find this, we can try to factorise:

-4x^2-9x-2=0
4x^2+9x+2=0
(4x+1)(x+2)=0
x=-2 and x=-1/4
x intercepts are
and

Parabolas are symmetrical, so if you take the x intercepts, the line of symmetry will be halfway between them.
(wow, nasty numbers)
x=-1.125 is the line of symmetry.

A question about the vertex: Have you covered differentiation?

Also, how would I graph this as a parabola? If both x are on the negative side