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- ax2+bx+c=0
- x2+bx/a+c/a=0
- x2+bx/a=-c/a
- x2+bx/a+b2/4a2=b2/4a2-c/a
- x2+bx/a+b2/4a2=b2/4a2-4ac/4a2
- x2+bx/a+b2/4a2=(b2-4ac)/4a2
- (x+b/2a)2=(b2-4ac)/4a2
- x+b/2a=+-sqrt(b2-4ac)/sqrt(4a2)
- x+b/2a=+-sqrt(b2-4ac)/2a
- x=-b/2a+-sqrt(b2-4ac)/2a
- x=(-b+-sqrt(b2-4ac))/2a
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