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✨ Best Answer ✨

1番合ってます👍
2番は
y=-x²+6x+7
=-(x²-6x-7)
=-(x-7)(x+1)
x=7,-1

さくら

ありがとうございます!(*´∇`*)

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Answers

(2)y=-x²+6x+7

x軸【y=0】
      0=-x²+6x+7

  x²-6x-7=0

(x+1)(x-7)=0

 x+1=0 から、x=-1

 x-7=0 から、x=7

さくら

有難うございます!(*´▽`*)

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