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Mathematics 18 Online
OpenStudy (anonymous):

Help !!

OpenStudy (kainui):

I'm on it!

OpenStudy (anonymous):

OpenStudy (anonymous):

b2-4ac if it gives you one solution, you can factor

OpenStudy (anonymous):

I attached it ^.^

OpenStudy (kainui):

Can you take the square root of a negative number?

OpenStudy (anonymous):

Yes ?

OpenStudy (phi):

Can you take the square root of a negative number? True, it is yes, BUT you get an imaginary number, which means you can not factor the quadratic into two real factors.

OpenStudy (phi):

b^2-4ac is called the discriminant See http://en.wikipedia.org/wiki/Discriminant

OpenStudy (anonymous):

In the equation , the discriminant is

OpenStudy (anonymous):

I see but I'm having trouble factoring it.

OpenStudy (anonymous):

The answe should be 1,7 ? @phi

OpenStudy (phi):

a= 2, b=7 , c=3 you want b^2 -4ac

OpenStudy (phi):

The question asks you to pick the expression that tells you if you factor the quadratic that means pick the discriminant (i.e. b*b-4*a*c) and then figure out its value for the quadratic they give you.

OpenStudy (phi):

Can you find the value of b*b-4*a*c if a=2, b=7, c=3 ?

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