(x-5)(x-4)=650
解:
(x-5)(x-4)=650
x²-9x+20-650=0
x²-9x-630=0
(x+21)(x-30)=0
x₁=-21
x₂=30
解:
(x-5)(x-4)=650
x²-9x+20-650=0
x²-9x-630=0
(x+21)(x-30)=0
x₁=-21
x₂=30
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解:
(x-5)(x-4)=650
x²-9x+20-650=0
x²-9x-630=0
(x+21)(x-30)=0
x₁=-21
x₂=30
解:
(x-5)(x-4)=650
x²-9x+20-650=0
x²-9x-630=0
(x+21)(x-30)=0
x₁=-21
x₂=30