x²-(x-5)(x+1)=?
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x²-(x-5)(x+1)=?
x²-(x-5)(x+1)=?
x²-(x-5)(x+1)=?
原式=x²-(x²-4x-5)
=x²-x²+4x+5
=4x+5
x²-(x-5)(x+1)= 4x+5
x²-(x-5)(x+1)=?
x²-(x-5)(x+1)=?
x²-(x-5)(x+1)=?
原式=x²-(x²-4x-5)
=x²-x²+4x+5
=4x+5
x²-(x-5)(x+1)= 4x+5