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Old 12-13-2006   #6
Sillysidley

 
Join Date: Oct 2006
Posts: 822
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x^2-3x-10=0

that's how it starts (this is a quadratic equation)


then i factored

for exampla: (x-m) (x+n)

and the original is ax^2+bx+c=0
m+n must equal b, and mn must equal c.
-5 and 2 add
up to -3

and they multiply to get -10

therefore, it is (x-5)(x+2)=0

either x-5=0, or x+2=0

therefore x=5, or -2

now who do u think is going to win mathcounts?

do u get how i did it?
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