일차함수는꼭지점이없어요이차함수인것같네요 y=ax²+b+c를y=a(x+b/2)²-ab²/4+c로고친뒤x자리에해당하는-b/2와y자리에해당하는-ab²/4+가꼭지점즉(-b/2,-ab²/4+c)
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