Math Is Fun Forum

Feli-ne

Guest

Quadratic equations

could anyone help me with these two problems, I've been stuck on them for ages.

1. identify if the following equation is linear, quadratic or other.

2x^2-4x+5=2(x^2-9)

2. rearrange the equation so that it is in standard form quadratic form.

1/x + x/2=x/3 + 1/2

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Quadratic equations

Hi Feli-ne;

1)

simplifies to

which is a linear equation.

Last edited by bobbym (2009-11-13 12:23:17)

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Feli-ne

Guest

Re: Quadratic equations

Thanks for the help, but i still can't seem to understand the second question.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Quadratic equations

Hi Feli-ne;

Maybe that is because although my answer was algebraically correct it is not what you requested. Please disregard it. Number one is fine though.

For 2 as I said you can put it into this quadratic equation form.

Then go here for a full explanation on how to convert to standard form.

http://www.analyzemath.com/quadraticg/quadraticg.htm

Last edited by bobbym (2009-11-13 12:54:40)

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Anakin

Member

Registered: 2009-10-04

Posts: 145

Re: Quadratic equations

2.

That would mean that it is in quadratic form, because the highest degree is 2. In other words, the first equation that you provided (1/x + x/2=x/3 + 1/2) has the same solutions as the quadratic I provided.