9x^2-30x-25

Question

9x^2-30x-25

anonymous · Answer

and what ?

anonymous · Answer

=0, BTW

anonymous · Answer

what is the discriminant ?

anonymous · Answer

Thanks

anonymous · Answer

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

anonymous · Answer

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.

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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?

anonymous · Answer

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

anonymous · Answer

:)