how do you solve x^2-3x by using the quadratic formula

I have to solve it by factoring and then using the quadratic formula. I think i know how to solve it by factoring I just don't know how to solve it using the quadratic formula. Help on this would be very appreciated.
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1 Answer

x^2 -3x=x*(x-3)

quadratik dont apli kauz yu dont hav all 3 terms

it assume +0...x^2 -3x +0=0

and giv (x-0)*(x-3)

quadratik...ansers=-b/2a +-root(b*b -4ac)/2a
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