ax²+bx+c=0 | ·4a
4a²x²+4abx+4ac = 0 | +b²-4ac
4a²x²+4abx+b² = b²-4ac
(2ax)²+2·2ax·b+b² = b²-4ac
(2ax+b)² = b²-4ac
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ax²+bx+c=0 | ·4a
4a²x²+4abx+4ac = 0 | +b²-4ac
4a²x²+4abx+b² = b²-4ac
(2ax)²+2·2ax·b+b² = b²-4ac
(2ax+b)² = b²-4ac