5x²+4x-1为什么=5((x+2/5)²-9/25)

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5x²+4x-1为什么=5((x+2/5)²-9/25)

5x²+4x-1为什么=5((x+2/5)²-9/25)
5x²+4x-1为什么=5((x+2/5)²-9/25)

5x²+4x-1为什么=5((x+2/5)²-9/25)
配方法:
5x²+4x-1
=5(x²+4/5x-1/5)
=5[(x+2/5)²-4/25-1/5]
=5[(x+2/5)²-9/25]