抛物线y=【k+1】x²+k²-9,开口向下,且经过原点,求k的值

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抛物线y=【k+1】x²+k²-9,开口向下,且经过原点,求k的值

抛物线y=【k+1】x²+k²-9,开口向下,且经过原点,求k的值
抛物线y=【k+1】x²+k²-9,开口向下,且经过原点,求k的值

抛物线y=【k+1】x²+k²-9,开口向下,且经过原点,求k的值
开口向下,则有k+1