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Mathematics 18 Online
OpenStudy (anonymous):

need help please

OpenStudy (marissalovescats):

What with ?

OpenStudy (anonymous):

Solve -2x2 +3x - 9 = 0

OpenStudy (marissalovescats):

You will use the quadratic formula again here

OpenStudy (anonymous):

ok

OpenStudy (marissalovescats):

Wait never mind you can factor this

OpenStudy (anonymous):

I was just going to say that.

OpenStudy (marissalovescats):

I glaned at the problem wrong the first time lol But yes you can factor this problem to find your zeros

OpenStudy (anonymous):

umm i dont know how to do that

OpenStudy (marissalovescats):

Is that -2x^2 supposed to be negative?

OpenStudy (anonymous):

yeah

OpenStudy (marissalovescats):

Then no you cannot factor this. The signs no not work. @jcpd910 You will yes have to use the quadratic formula. It looks like it will factor but theres no way you can get the -2x^2 and the -9 because you get -9x which isn't -3x.

OpenStudy (anonymous):

ohh ok

OpenStudy (marissalovescats):

So you'll use the quadratic formula and a=-2 b=3 c=-9

OpenStudy (anonymous):

how do you make the equaiton

OpenStudy (marissalovescats):

The quadratic formula is always this and you just plug in your values of what you have for a b and c\[\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]

OpenStudy (anonymous):

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