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Mathematics 86 Online
OpenStudy (anonymous):

9x^2-30x-25

OpenStudy (anonymous):

and what ?

OpenStudy (anonymous):

=0, BTW

OpenStudy (anonymous):

what is the discriminant ?

OpenStudy (anonymous):

Thanks

OpenStudy (anonymous):

@JaredP: \[ 9x ^{2} - 30x - 25 \neq (3x - 5) (3x - 5) \] but \[ 9x ^{2} - 30x + 25 = (3x - 5) (3x - 5) \]

OpenStudy (anonymous):

You should understand it though, getting answers on here is a waste of everyones time. Go to wolfram alpha if you just want the answer. If you don't understand how I got that answer than just say so.

OpenStudy (anonymous):

@JaredP: The OP's equation do not have any real solution.

OpenStudy (anonymous):

oh crap your right! you have to use quadratic equation then.

OpenStudy (anonymous):

What JaredP means that you should us quadratic fromula which will give you : \[ \left\{\left\{x= \frac{5}{3} \left(1-\sqrt{2}\right)\right\},\left\{x=\frac{5}{3} \left(1+\sqrt{2}\right)\right\}\right\} \]

OpenStudy (anonymous):

In your case \[ax^2 - bx - c\] \[(-b \pm \sqrt{b^2-4ac})/2a\] so in your case a=9, b = -30 and c=-25 Did I get that right FoolForMath?

OpenStudy (anonymous):

http://www.wolframalpha.com/input/?i=quadratic+theory this site is really amazing

OpenStudy (anonymous):

:)

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