solve equation x²+6x+5=0 by using formula method
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without formula:
x2+x+5x+5=0
x(x+1)+5(x+1)=0
(x+1)(x+5)=0 which gives x=-1,-5
by formula:
-6+-root(36-20)/2
=-6+-root16/2
=-6+4/2 & -6-4/2
=-2/2 & -10/2
=-1 & -5
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