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x=-b+-raiz(b^2-4ac)/2a
x= 10+-raiz(10^2-4*1*25)/2*1=10/2=5
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2.- x2+6x+12=0
la misma formula
x=-6+-raiz(6^2-4*(-1)*12)/2*1=
x1=7,58 x2=-1,58